diff --git a/.gitignore b/.gitignore
index 3d1b3b5..ef5ce8f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,8 @@
 *script*
-.idea*
\ No newline at end of file
+.idea*
+
+# pdm toolchain
+.pdm-build
+.pdm-python
+pdm.lock
+.pdm-build/
\ No newline at end of file
diff --git a/main.py b/main.py
index 4e86335..724f01b 100644
--- a/main.py
+++ b/main.py
@@ -1,153 +1,46 @@
-# -*- coding: utf-8 -*-
-"""
-Copyright (C) 2020-2024 LiteyukiStudio. All Rights Reserved 
-
-@Time    : 2024/8/6 下午1:30
-@Author  : snowykami
-@Email   : snowykami@outlook.com
-@File    : main.py
-@Software: PyCharm
-"""
-import logging
-
-from mbcp.mp_math.line import Line3
-from mbcp.mp_math.plane import Plane3
-from mbcp.mp_math.point import Point3
-
-# def ac8s4e4():
-#     """
-#     第八章第四节例4
-#     问题：求与两平面x-4z-3=0和2x-y-5z-1=0的交线平行且过点(-3, 2, 5)的直线方程。
-#     """
-#     correct_ans = Line3(4, 3, 1, 1)
-#
-#     pl1 = Plane3(1, 0, -4, -3)
-#     pl2 = Plane3(2, -1, -5, -1)
-#     p = Point3(-3, 2, 5)
-#     """解法1"""
-#     # 求直线方向向量s
-#     s = pl1.normal @ pl2.normal
-#     actual_ans = Line3.from_point_and_direction(p, s)
-#
-#     logging.info(f"正确答案：{correct_ans}    实际答案：{actual_ans}")
-#     assert actual_ans == correct_ans
-#
-#     """解法2"""
-#     # 过点p且与pl1平行的平面pl3
-#     pl3 = pl1.cal_parallel_plane3(p)
-#     # 过点p且与pl2平行的平面pl4
-#     pl4 = pl2.cal_parallel_plane3(p)
-#     # 求pl3和pl4的交线
-#     actual_ans = pl3.cal_intersection_line3(pl4)
-#     print(pl3, pl4, actual_ans)
-#
-#     logging.info(f"正确答案：{correct_ans}    实际答案：{actual_ans}")
-#     assert actual_ans == correct_ans
-#
-#
-# ac8s4e4()
-import logging
-
-from mbcp.mp_math.mp_math_typing import RealNumber
-from mbcp.mp_math.utils import Approx
+from typing import overload
 
 
-def three_var_func(x: RealNumber, y: RealNumber) -> RealNumber:
-    return x ** 3 * y ** 2 - 3 * x * y ** 3 - x * y + 1
+class Vector:
+    def __init__(self, x: float, y: float, z: float):
+        """
+        向量
+        Args:
+            x: x轴分量
+            y: y轴分量
+            z: z轴分量
+        """
+        self.x = x
+        self.y = y
+        self.z = z
+    @overload
+    def __mul__(self, other: float) -> 'Vector':
+        ...
+
+    @overload
+    def __mul__(self, other: 'Vector') -> float:
+        ...
+
+    def __mul__(self, other):
+        """
+        点乘和数乘
+        Args:
+            other:
+
+        Returns:
+        """
+        if isinstance(other, (float, int)):
+            return Vector(self.x * other, self.y * other, self.z * other)
+        elif isinstance(other, Vector):
+            return self.x * other.x + self.y * other.y + self.z * other.z
+        else:
+            raise TypeError(f"unsupported operand type(s) for *: 'Vector' and '{type(other)}'")
+
+    def __rmul__(self, other: float) -> 'Vector':
+        return self.__mul__(other)
 
 
-class TestPartialDerivative:
-    # 样例来源：同济大学《高等数学》第八版下册 第九章第二节 例6
-    def test_2v_1o_1v(self):
-        """测试二元函数关于第一个变量(x)的一阶偏导 df/dx"""
+v: Vector = Vector(1, 2, 3) * 3.0
+v2: Vector = 3.0 * Vector(1, 2, 3)
 
-        from mbcp.mp_math.utils import Approx
-        from mbcp.mp_math.equation import get_partial_derivative_func
-
-        partial_derivative_func = get_partial_derivative_func(three_var_func, 0)
-
-        # assert partial_derivative_func(1, 2, 3) == 4.0
-        def df_dx(x, y):
-            """原函数关于x的偏导"""
-            return 3 * (x ** 2) * (y ** 2) - 3 * (y ** 3) - y
-
-        logging.info(f"Expected: {df_dx(1, 2)}, Actual: {partial_derivative_func(1, 2)}")
-        assert Approx(partial_derivative_func(1, 2)) == df_dx(1, 2)
-
-    def test_2v_1o_2v(self):
-        """测试二元函数关于第二个变量(y)的一阶偏导 df/dy"""
-
-        from mbcp.mp_math.utils import Approx
-        from mbcp.mp_math.equation import get_partial_derivative_func
-
-        partial_derivative_func = get_partial_derivative_func(three_var_func, 1)
-
-        def df_dy(x, y):
-            """原函数关于y的偏导"""
-            return 2 * (x ** 3) * y - 9 * x * (y ** 2) - x
-
-        logging.info(f"Expected: {df_dy(1, 2)}, Actual: {partial_derivative_func(1, 2)}")
-        assert Approx(partial_derivative_func(1, 2)) == df_dy(1, 2)
-
-    def test_2v_2o_12v(self):
-        """高阶偏导d^2f/(dxdy)"""
-
-        from mbcp.mp_math.utils import Approx
-        from mbcp.mp_math.equation import get_partial_derivative_func
-
-        partial_derivative_func = get_partial_derivative_func(three_var_func, (0, 1))
-
-        def df_dxdy(x, y):
-            """原函数关于y和x的偏导"""
-            return 6 * x ** 2 * y - 9 * y ** 2 - 1
-
-        logging.info(f"Expected: {df_dxdy(1, 2)}, Actual: {partial_derivative_func(1, 2)}")
-        assert Approx(partial_derivative_func(1, 2)) == df_dxdy(1, 2)
-
-    def test_2v_2o_1v2(self):
-        """二阶偏导d^2f/(dx^2)"""
-
-        from mbcp.mp_math.utils import Approx
-        from mbcp.mp_math.equation import get_partial_derivative_func
-
-        partial_derivative_func = get_partial_derivative_func(three_var_func, (0, 0))
-
-        def df_dydx(x, y):
-            """原函数关于x和y的偏导"""
-            return 6 * x * y ** 2
-
-        logging.info(f"Expected: {df_dydx(1, 2)}, Actual: {partial_derivative_func(1, 2)}")
-        assert Approx(partial_derivative_func(1, 2)) == df_dydx(1, 2)
-
-    def test_2v_3o_1v3(self):
-        """高阶偏导d^3f/(dx^3)"""
-
-        from mbcp.mp_math.utils import Approx
-        from mbcp.mp_math.equation import get_partial_derivative_func
-
-        partial_derivative_func = get_partial_derivative_func(three_var_func, (0, 0, 0))
-
-        def d3f_dx3(x, y):
-            """原函数关于x的三阶偏导"""
-            return 6 * (y ** 2)
-
-        logging.info(f"Expected: {d3f_dx3(1, 2)}, Actual: {partial_derivative_func(1, 2)}")
-        assert Approx(partial_derivative_func(1, 2)) == d3f_dx3(1, 2)
-
-    def test_possible_error(self):
-        from mbcp.mp_math.equation import get_partial_derivative_func
-        def two_vars_func(x: RealNumber, y: RealNumber) -> RealNumber:
-            return x ** 2 * y ** 2
-
-        partial_func = get_partial_derivative_func(two_vars_func, 0)
-        partial_func_2 = get_partial_derivative_func(two_vars_func, (0, 0))
-        assert Approx(partial_func_2(1, 2)) == 8
-
-
-TestPartialDerivative().test_2v_1o_1v()
-TestPartialDerivative().test_2v_1o_2v()
-TestPartialDerivative().test_2v_2o_12v()
-TestPartialDerivative().test_2v_2o_1v2()
-TestPartialDerivative().test_2v_3o_1v3()
-
-TestPartialDerivative().test_possible_error()
+print(v, v2)
\ No newline at end of file
diff --git a/mbcp/mp_math/angle.py b/mbcp/mp_math/angle.py
index 5dc140f..f339c06 100644
--- a/mbcp/mp_math/angle.py
+++ b/mbcp/mp_math/angle.py
@@ -10,7 +10,7 @@ Copyright (C) 2020-2024 LiteyukiStudio. All Rights Reserved
 """
 from typing import overload
 
-from .const import PI
+from .const import PI  # type: ignore
 
 
 class AnyAngle:
@@ -27,7 +27,7 @@ class AnyAngle:
             self.radian = value * PI / 180
 
     @property
-    def complementary(self) -> "AnyAngle":
+    def complementary(self) -> 'AnyAngle':
         """
         余角：两角的和为90°。
         Returns:
@@ -36,7 +36,7 @@ class AnyAngle:
         return AnyAngle(PI / 2 - self.minimum_positive.radian, is_radian=True)
 
     @property
-    def supplementary(self) -> "AnyAngle":
+    def supplementary(self) -> 'AnyAngle':
         """
         补角：两角的和为180°。
         Returns:
@@ -54,7 +54,7 @@ class AnyAngle:
         return self.radian * 180 / PI
 
     @property
-    def minimum_positive(self) -> "AnyAngle":
+    def minimum_positive(self) -> 'AnyAngle':
         """
         最小正角。
         Returns:
@@ -63,7 +63,7 @@ class AnyAngle:
         return AnyAngle(self.radian % (2 * PI))
 
     @property
-    def maximum_negative(self) -> "AnyAngle":
+    def maximum_negative(self) -> 'AnyAngle':
         """
         最大负角。
         Returns:
@@ -71,21 +71,21 @@ class AnyAngle:
         """
         return AnyAngle(-self.radian % (2 * PI), is_radian=True)
 
-    def __add__(self, other: "AnyAngle") -> "AnyAngle":
+    def __add__(self, other: 'AnyAngle') -> 'AnyAngle':
         return AnyAngle(self.radian + other.radian, is_radian=True)
 
-    def __sub__(self, other: "AnyAngle") -> "AnyAngle":
+    def __sub__(self, other: 'AnyAngle') -> 'AnyAngle':
         return AnyAngle(self.radian - other.radian, is_radian=True)
 
-    def __mul__(self, other: float) -> "AnyAngle":
+    def __mul__(self, other: float) -> 'AnyAngle':
         return AnyAngle(self.radian * other, is_radian=True)
 
     @overload
-    def __truediv__(self, other: float) -> "AnyAngle":
+    def __truediv__(self, other: float) -> 'AnyAngle':
         ...
 
     @overload
-    def __truediv__(self, other: "AnyAngle") -> float:
+    def __truediv__(self, other: 'AnyAngle') -> float:
         ...
 
     def __truediv__(self, other):
diff --git a/mbcp/mp_math/line.py b/mbcp/mp_math/line.py
index 07f9537..93945ac 100644
--- a/mbcp/mp_math/line.py
+++ b/mbcp/mp_math/line.py
@@ -8,87 +8,55 @@ Copyright (C) 2020-2024 LiteyukiStudio. All Rights Reserved
 @File    : other.py
 @Software: PyCharm
 """
-import math
-from typing import TYPE_CHECKING, overload
+from typing import TYPE_CHECKING
+
+from .mp_math_typing import OneSingleVarFunc, RealNumber
+from .utils import sign_format
 from .vector import Vector3
 
 if TYPE_CHECKING:
     from .angle import AnyAngle
-    from .plane import Plane3
     from .point import Point3
 
 
 class Line3:
-    def __init__(self, a: float, b: float, c: float, d: float):
+    def __init__(self, point: 'Point3', direction: 'Vector3'):
         """
-        三维空间中的直线。
+        三维空间中的直线。由一个点和一个方向向量确定。
         Args:
-            a: 直线方程的系数a
-            b: 直线方程的系数b
-            c: 直线方程的系数c
-            d: 直线方程的常数项d
+            point: 直线上的一点
+            direction: 直线的方向向量
         """
-        self.a = a
-        self.b = b
-        self.c = c
-        self.d = d
+        self.point = point
+        self.direction = direction
 
-    def cal_angle(self, other: "Line3") -> "AnyAngle":
+    def cal_angle(self, other: 'Line3') -> 'AnyAngle':
         """
-        计算直线和直线或面之间的夹角。
+        计算直线和直线之间的夹角。
         Args:
-            other: 另一条直线或面
+            other: 另一条直线
         Returns:
             夹角弧度
         Raises:
             TypeError: 不支持的类型
         """
-        if isinstance(other, Line3):
-            return self.direction.cal_angle(other.direction)
-        elif isinstance(other, Plane3):
-            return self.direction.cal_angle(other.normal).complementary  # 方向向量和法向量的夹角的余角
-        else:
-            raise TypeError(f"Unsupported type: {type(other)}")
+        return self.direction.cal_angle(other.direction)
 
-    @property
-    def direction(self) -> "Vector3":
-        """
-        直线的方向向量。
-        Returns:
-            方向向量
-        """
-        return Vector3(self.a, self.b, self.c)
-
-    def cal_intersection(self, line: "Line3") -> "Point3":
+    def cal_intersection(self, other: 'Line3') -> 'Point3':
         """
         计算两条直线的交点。
         Args:
-            line: 另一条直线
+            other: 另一条直线
         Returns:
             交点
         """
-
-        if self.is_parallel(line):
+        if self.is_parallel(other):
             raise ValueError("Lines are parallel and do not intersect.")
-
-        if self.is_collinear(line):
-            raise ValueError("Lines are collinear and do not have a single intersection point.")
-
-        if not self.is_coplanar(line):
+        if not self.is_coplanar(other):
             raise ValueError("Lines are not coplanar and do not intersect.")
+        return self.point + self.direction.cross(other.direction)
 
-        a1, b1, c1, d1 = self.a, self.b, self.c, self.d
-        a2, b2, c2, d2 = line.a, line.b, line.c, line.d
-
-        t = (b1 * (c2 * d1 - c1 * d2) - b2 * (c1 * d1 - c2 * d2)) / (b1 * c2 - b2 * c1)
-
-        x = self.a * t + self.b * (-d1 / self.b)
-        y = -self.b * t + self.a * (d1 / self.a)
-        z = 0
-
-        return Point3(x, y, z)
-
-    def cal_perpendicular(self, point: "Point3") -> "Line3":
+    def cal_perpendicular(self, point: 'Point3') -> 'Line3':
         """
         计算直线经过指定点p的垂线。
         Args:
@@ -96,64 +64,78 @@ class Line3:
         Returns:
             垂线
         """
-        a = -self.b
-        b = self.a
-        c = 0
-        d = -(a * point.x + b * point.y + self.c * point.z)
-        return Line3(a, b, c, d)
+        return Line3(point, self.direction.cross(point - self.point))
 
-    def is_parallel(self, line: "Line3") -> bool:
+    def get_point(self, t: RealNumber) -> 'Point3':
+        """
+        获取直线上的点。同一条直线，但起始点和方向向量不同，则同一个t对应的点不同。
+        Args:
+            t: 参数t
+        Returns:
+            点
+        """
+        return self.point + t * self.direction
+
+    def get_parametric_equations(self) -> tuple[OneSingleVarFunc, OneSingleVarFunc, OneSingleVarFunc]:
+        """
+        获取直线的参数方程。
+        Returns:
+            x(t), y(t), z(t)
+        """
+        return (lambda t: self.point.x + self.direction.x * t,
+                lambda t: self.point.y + self.direction.y * t,
+                lambda t: self.point.z + self.direction.z * t)
+
+    def is_parallel(self, other: 'Line3') -> bool:
         """
         判断两条直线是否平行。
-        直线平行的条件是它们的法向量成比例
         Args:
-            line: 另一条直线
+            other: 另一条直线
         Returns:
             是否平行
         """
-        return self.direction.is_parallel(line.direction)
+        return self.direction.is_parallel(other.direction)
 
-    def is_collinear(self, line: "Line3") -> bool:
+    def is_collinear(self, other: 'Line3') -> bool:
         """
         判断两条直线是否共线。
-        直线共线的条件是它们的法向量成比例且常数项也成比例
         Args:
-            line: 另一条直线
+            other: 另一条直线
         Returns:
             是否共线
         """
-        return self.is_parallel(line) and (self.d * line.b - self.b * line.d) / (self.a * line.b - self.b * line.a) == 0
+        return self.is_parallel(other) and (self.point - other.point).is_parallel(self.direction)
 
-    def is_coplanar(self, line: "Line3") -> bool:
+    def is_coplanar(self, other: 'Line3') -> bool:
         """
         判断两条直线是否共面。
-        两条直线共面的条件是它们的方向向量和法向量的叉乘为零向量
         Args:
-            line: 另一条直线
+            other: 另一条直线
         Returns:
             是否共面
         """
-        direction1 = (-self.c, 0, self.a)
-        direction2 = (line.c, -line.b, 0)
-        cross_product = direction1[0] * direction2[1] - direction1[1] * direction2[0]
-        return cross_product == 0
+        return self.direction.cross(other.direction).is_parallel(self.direction)
+
+    def simplify(self):
+        """
+        简化直线方程，等价相等。
+        自体简化，不返回值。
+
+        按照可行性一次对x y z 化 0 处理，并对向量单位化
+        """
+        self.direction.normalize()
+        # 平行与zy平面，x始终为0
+        if self.direction.x == 0:
+            self.point.x = 0
+        # 平行与xz平面，y始终为0
+        if self.direction.y == 0:
+            self.point.y = 0
+        # 平行与xy平面，z始终为0
+        if self.direction.z == 0:
+            self.point.z = 0
 
     @classmethod
-    def from_point_and_direction(cls, point: "Point3", direction: "Vector3") -> "Line3":
-        """
-        工厂函数 由点和方向向量构造直线(点向式构造)。
-        Args:
-            point: 点
-            direction: 方向向量
-        Returns:
-            直线
-        """
-        a, b, c = direction.x, direction.y, direction.z
-        d = -(a * point.x + b * point.y + c * point.z)
-        return cls(a, b, c, d)
-
-    @classmethod
-    def from_two_points(cls, p1: "Point3", p2: "Point3") -> "Line3":
+    def from_two_points(cls, p1: 'Point3', p2: 'Point3') -> 'Line3':
         """
         工厂函数 由两点构造直线。
         Args:
@@ -163,21 +145,45 @@ class Line3:
             直线
         """
         direction = p2 - p1
-        return cls.from_point_and_direction(p1, direction)
+        return cls(p1, direction)
+
+    def __and__(self, other: 'Line3') -> 'Point3':
+        """
+        计算两条直线点集合的交集。交点
+        Args:
+            other: 另一条直线
+        Returns:
+            交点
+        """
+        return self.cal_intersection(other)
 
     def __eq__(self, other) -> bool:
         """
         判断两条直线是否等价。
+
+        v1 // v2 ∧ (p1 - p2) // v1
         Args:
             other:
 
         Returns:
 
         """
-        return self.a / other.a == self.b / other.b == self.c / other.c == self.d / other.d
-
-    def __repr__(self):
-        return f"Line3({self.a}, {self.b}, {self.c}, {self.d})"
+        return self.direction.is_parallel(other.direction) and (self.point - other.point).is_parallel(self.direction)
 
     def __str__(self):
-        return f"Line3({self.a}, {self.b}, {self.c}, {self.d})"
+        """
+        返回点向式（x-x0）
+        Returns:
+
+        """
+        s = "Line3: "
+        if self.direction.x != 0:
+            s += f"(x{sign_format(-self.point.x)})/{self.direction.x}"
+        if self.direction.y != 0:
+            s += f" = (y{sign_format(-self.point.y)})/{self.direction.y}"
+        if self.direction.z != 0:
+            s += f" = (z{sign_format(-self.point.z)})/{self.direction.z}"
+        return s
+
+    def __repr__(self):
+        return f"Line3({self.point}, {self.direction})"
diff --git a/mbcp/mp_math/plane.py b/mbcp/mp_math/plane.py
index 5041303..a979e62 100644
--- a/mbcp/mp_math/plane.py
+++ b/mbcp/mp_math/plane.py
@@ -3,13 +3,14 @@
 平面模块
 """
 import math
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, overload
 
 import numpy as np
 
-from .vector import Vector3
+from .vector import Vector3, zero_vector3
 from .line import Line3
 from .point import Point3
+from .utils import sign
 
 if TYPE_CHECKING:
     from .angle import AnyAngle
@@ -30,7 +31,7 @@ class Plane3:
         self.c = c
         self.d = d
 
-    def cal_angle(self, other: "Line3 | Plane3") -> "AnyAngle":
+    def cal_angle(self, other: 'Line3 | Plane3') -> 'AnyAngle':
         """
         计算平面与平面之间的夹角。
         Args:
@@ -43,11 +44,11 @@ class Plane3:
         if isinstance(other, Line3):
             return self.normal.cal_angle(other.direction).complementary
         elif isinstance(other, Plane3):
-            return AnyAngle(math.acos(self.normal * other.normal / (self.normal.length * other.normal.length)), is_radian=True)
+            return AnyAngle(math.acos(self.normal @ other.normal / (self.normal.length * other.normal.length)), is_radian=True)
         else:
             raise TypeError(f"Unsupported type: {type(other)}")
 
-    def cal_distance(self, other: "Plane3 | Point3") -> float:
+    def cal_distance(self, other: 'Plane3 | Point3') -> float:
         """
         计算平面与平面或点之间的距离。
         Args:
@@ -64,27 +65,58 @@ class Plane3:
         else:
             raise TypeError(f"Unsupported type: {type(other)}")
 
-    def cal_intersection_line3(self, other: "Plane3") -> "Line3":
+    def cal_intersection_line3(self, other: 'Plane3') -> 'Line3':
         """
         计算两平面的交线。该方法有问题，待修复。
         Args:
             other: 另一个平面
         Returns:
             交线
+        Raises:
         """
-        # 计算两法向量的叉积作为交线的方向向量
-        s = self.normal.cross(other.normal)  # 交线的方向向量
-        # 联立两平面方程求交线的一点
-        # 两平面方程联立得到的方程组
-        # | a1x + b1y + c1z = -d1
-        # | a2x + b2y + c2z = -d2
-        # 用numpy解方程组
-        a = np.array([[self.a, self.b, self.c], [other.a, other.b, other.c]])
-        b = np.array([-self.d, -other.d])
-        p = np.linalg.lstsq(a, b, rcond=None)[0]
-        return Line3.from_point_and_direction(Point3(*p), s)
+        if self.normal.is_parallel(other.normal):
+            raise ValueError("Planes are parallel and have no intersection.")
+        direction = self.normal.cross(other.normal)  # 法向量叉乘得到方向向量
+        # 寻找直线上的一点，依次假设x=0, y=0, z=0，找到合适的点
+        x, y, z = 0, 0, 0
+        # 依次判断条件假设x=0, y=0, z=0，找到合适的点
+        # 先假设其中一个系数不为0，则令此坐标为0，构建增广矩阵，解出另外两个坐标
+        if self.a != 0 and other.a != 0:
+            A = np.array([[self.b, self.c], [other.b, other.c]])
+            B = np.array([-self.d, -other.d])
+            y, z = np.linalg.solve(A, B)
+        elif self.b != 0 and other.b != 0:
+            A = np.array([[self.a, self.c], [other.a, other.c]])
+            B = np.array([-self.d, -other.d])
+            x, z = np.linalg.solve(A, B)
+        elif self.c != 0 and other.c != 0:
+            A = np.array([[self.a, self.b], [other.a, other.b]])
+            B = np.array([-self.d, -other.d])
+            x, y = np.linalg.solve(A, B)
 
-    def cal_parallel_plane3(self, point: "Point3") -> "Plane3":
+        return Line3(Point3(x, y, z), direction)
+
+    def cal_intersection_point3(self, other: 'Line3') -> 'Point3':
+        """
+        计算平面与直线的交点。
+        Args:
+            other: 不与平面平行或在平面上的直线
+        Returns:
+            交点
+        Raises:
+            ValueError: 平面与直线平行或重合
+        """
+        # 若平面的法向量与直线方向向量垂直，则直线与平面平行或重合
+        if self.normal @ other.direction == 0:
+            raise ValueError("The plane and the line are parallel or coincident.")
+        # 获取直线的参数方程
+        # 代入平面方程，解出t
+        x, y, z = other.get_parametric_equations()
+        t = (-(self.a * other.point.x + self.b * other.point.y + self.c * other.point.z + self.d) /
+             (self.a * other.direction.x + self.b * other.direction.y + self.c * other.direction.z))
+        return Point3(x(t), y(t), z(t))
+
+    def cal_parallel_plane3(self, point: 'Point3') -> 'Plane3':
         """
         计算平行于该平面且过指定点的平面。
         Args:
@@ -95,7 +127,7 @@ class Plane3:
         return Plane3.from_point_and_normal(point, self.normal)
 
     @property
-    def normal(self) -> "Vector3":
+    def normal(self) -> 'Vector3':
         """
         平面的法向量。
         Returns:
@@ -104,7 +136,7 @@ class Plane3:
         return Vector3(self.a, self.b, self.c)
 
     @classmethod
-    def from_point_and_normal(cls, point: "Point3", normal: "Vector3") -> "Plane3":
+    def from_point_and_normal(cls, point: 'Point3', normal: 'Vector3') -> 'Plane3':
         """
         工厂函数 由点和法向量构造平面(点法式构造)。
         Args:
@@ -117,8 +149,93 @@ class Plane3:
         d = -a * point.x - b * point.y - c * point.z  # d = -ax - by - cz
         return cls(a, b, c, d)
 
+    @classmethod
+    def from_three_points(cls, p1: 'Point3', p2: 'Point3', p3: 'Point3') -> 'Plane3':
+        """
+        工厂函数 由三点构造平面。
+        Args:
+            p1: 点1
+            p2: 点2
+            p3: 点3
+        Returns:
+            平面
+        """
+        # 两个向量
+        v1 = p2 - p1
+        v2 = p3 - p1
+        # 法向量
+        normal = v1.cross(v2)
+        return cls.from_point_and_normal(p1, normal)
+
+    @classmethod
+    def from_two_lines(cls, l1: 'Line3', l2: 'Line3') -> 'Plane3':
+        """
+        工厂函数 由两直线构造平面。
+        Args:
+            l1: 直线1
+            l2: 直线2
+        Returns:
+            平面
+        """
+        v1 = l1.direction
+        v2 = l2.point - l1.point
+        if v2 == zero_vector3:
+            v2 = l2.get_point(1) - l1.point
+        return cls.from_point_and_normal(l1.point, v1.cross(v2))
+
+    @classmethod
+    def from_point_and_line(cls, point: 'Point3', line: 'Line3') -> 'Plane3':
+        """
+        工厂函数 由点和直线构造平面。
+        Args:
+            point: 面上一点
+            line: 面上直线，不包含点
+        Returns:
+            平面
+        """
+        return cls.from_point_and_normal(point, line.direction)
+
     def __repr__(self):
         return f"Plane3({self.a}, {self.b}, {self.c}, {self.d})"
 
     def __str__(self):
-        return f"{self.a}x + {self.b}y + {self.c}z + {self.d} = 0"
+        s = "Plane3: "
+        if self.a != 0:
+            s += f"{sign(self.a, only_neg=True)}{abs(self.a)}x"
+        if self.b != 0:
+            s += f" {sign(self.b)} {abs(self.b)}y"
+        if self.c != 0:
+            s += f" {sign(self.c)} {abs(self.c)}z"
+        if self.d != 0:
+            s += f" {sign(self.d)} {abs(self.d)}"
+        return s + " = 0"
+
+    @overload
+    def __and__(self, other: 'Line3') -> 'Point3 | None':
+        ...
+
+    @overload
+    def __and__(self, other: 'Plane3') -> 'Line3 | None':
+        ...
+
+    def __and__(self, other):
+        """
+        取两平面的交集（人话：交线）
+        Args:
+            other:
+        Returns:
+            不平行平面的交线，平面平行返回None
+        """
+        if isinstance(other, Plane3):
+            if self.normal.is_parallel(other.normal):
+                return None
+            return self.cal_intersection_line3(other)
+        elif isinstance(other, Line3):
+            if self.normal @ other.direction == 0:
+                return None
+            return self.cal_intersection_point3(other)
+        else:
+            raise TypeError(f"unsupported operand type(s) for &: 'Plane3' and '{type(other)}'")
+
+    def __rand__(self, other: 'Line3') -> 'Point3':
+        return self.cal_intersection_point3(other)
diff --git a/mbcp/mp_math/point.py b/mbcp/mp_math/point.py
index 4583994..ff6ce9f 100644
--- a/mbcp/mp_math/point.py
+++ b/mbcp/mp_math/point.py
@@ -8,9 +8,10 @@ class Point3:
     def __init__(self, x: float, y: float, z: float):
         """
         笛卡尔坐标系中的点。
-        :param x:
-        :param y:
-        :param z:
+        Args:
+            x: x 坐标
+            y: y 坐标
+            z: z 坐标
         """
         self.x = x
         self.y = y
@@ -31,26 +32,30 @@ class Point3:
         """
         P + V -> P
         P + P -> P
-        :param other:
-        :return:
+        Args:
+            other:
+        Returns:
         """
         return Point3(self.x + other.x, self.y + other.y, self.z + other.z)
 
+    def __eq__(self, other):
+        """
+        判断两个点是否相等。
+        Args:
+            other:
+        Returns:
+        """
+        return self.x == other.x and self.y == other.y and self.z == other.z
+
     def __sub__(self, other: "Point3") -> "Vector3":
         """
         P - P -> V
 
         P - V -> P  已在 :class:`Vector3` 中实现
-        :param other:
-        :return:
+        Args:
+            other:
+        Returns:
+
         """
         from .vector import Vector3
         return Vector3(self.x - other.x, self.y - other.y, self.z - other.z)
-
-    def __truediv__(self, other: float) -> "Point3":
-        """
-        P / n -> P
-        :param other:
-        :return:
-        """
-        return Point3(self.x / other, self.y / other, self.z / other)
diff --git a/mbcp/mp_math/utils.py b/mbcp/mp_math/utils.py
index 368a302..ef5c072 100644
--- a/mbcp/mp_math/utils.py
+++ b/mbcp/mp_math/utils.py
@@ -56,3 +56,38 @@ def approx(x: float, y: float = 0.0, epsilon: float = 0.0001) -> bool:
         是否近似相等
     """
     return abs(x - y) < epsilon
+
+
+def sign(x: float, only_neg: bool = False) -> str:
+    """获取数的符号。
+    Args:
+        x: 数
+        only_neg: 是否只返回负数的符号
+    Returns:
+        符号 + - ""
+    """
+    if x > 0:
+        return "+" if not only_neg else ""
+    elif x < 0:
+        return "-"
+    else:
+        return ""
+
+
+def sign_format(x: float, only_neg: bool = False) -> str:
+    """格式化符号数
+    -1 -> -1
+    1 -> +1
+    0 -> ""
+    Args:
+        x: 数
+        only_neg: 是否只返回负数的符号
+    Returns:
+        符号 + - ""
+    """
+    if x > 0:
+        return f"+{x}" if not only_neg else f"{x}"
+    elif x < 0:
+        return f"-{abs(x)}"
+    else:
+        return ""
diff --git a/mbcp/mp_math/vector.py b/mbcp/mp_math/vector.py
index ed2c3c3..dcfec2c 100644
--- a/mbcp/mp_math/vector.py
+++ b/mbcp/mp_math/vector.py
@@ -1,6 +1,7 @@
 import math
 from typing import overload, TYPE_CHECKING
 
+from .mp_math_typing import RealNumber
 from .point import Point3
 
 if TYPE_CHECKING:
@@ -10,10 +11,11 @@ if TYPE_CHECKING:
 class Vector3:
     def __init__(self, x: float, y: float, z: float):
         """
-        笛卡尔坐标系中的向量。
-        :param x:
-        :param y:
-        :param z:
+        3维向量
+        Args:
+            x: x轴分量
+            y: y轴分量
+            z: z轴分量
         """
         self.x = x
         self.y = y
@@ -27,7 +29,7 @@ class Vector3:
         Returns:
             夹角
         """
-        return AnyAngle(math.acos(self * other / (self.length * other.length)), is_radian=True)
+        return AnyAngle(math.acos(self @ other / (self.length * other.length)), is_radian=True)
 
     def is_parallel(self, other: 'Vector3') -> bool:
         """
@@ -37,20 +39,39 @@ class Vector3:
         Returns:
             是否平行
         """
-        return self @ other == Vector3(0, 0, 0)
+        return self.cross(other) == Vector3(0, 0, 0)
 
     def cross(self, other: 'Vector3') -> 'Vector3':
         """
-        向量积 叉乘：V1 @ V2 -> V3
+        向量积 叉乘：v1 cross v2 -> v3
+        返回如下行列式的结果：
+
+        ``i  j  k``
+
+        ``x1 y1 z1``
+
+        ``x2 y2 z2``
+
         Args:
             other:
         Returns:
-            叉乘结果，为0向量则两向量平行，否则垂直于两向量
+            行列式的结果
         """
         return Vector3(self.y * other.z - self.z * other.y,
                        self.z * other.x - self.x * other.z,
                        self.x * other.y - self.y * other.x)
 
+    def normalize(self):
+        """
+        将向量归一化。
+
+        自体归一化，不返回值。
+        """
+        length = self.length
+        self.x /= length
+        self.y /= length
+        self.z /= length
+
     @property
     def length(self) -> float:
         """
@@ -117,7 +138,7 @@ class Vector3:
         ...
 
     @overload
-    def __sub__(self, other: 'Point3') -> 'Point3':
+    def __sub__(self, other: 'Point3') -> "Point3":
         ...
 
     def __sub__(self, other):
@@ -133,9 +154,9 @@ class Vector3:
         elif isinstance(other, Point3):
             return Point3(self.x - other.x, self.y - other.y, self.z - other.z)
         else:
-            raise TypeError(f"unsupported operand type(s) for -: 'Vector3' and '{type(other)}'")
+            raise TypeError(f"unsupported operand type(s) for -: \"Vector3\" and \"{type(other)}\"")
 
-    def __rsub__(self, other: Point3):
+    def __rsub__(self, other: 'Point3'):
         """
         P - V -> P
         Args:
@@ -150,54 +171,41 @@ class Vector3:
             raise TypeError(f"unsupported operand type(s) for -: '{type(other)}' and 'Vector3'")
 
     @overload
-    def __mul__(self, other: float) -> 'Vector3':
+    def __mul__(self, other: RealNumber) -> 'Vector3':
         ...
 
     @overload
-    def __mul__(self, other: 'Vector3') -> float:
+    def __mul__(self, other: 'Vector3') -> 'Vector3':
         ...
 
-    def __mul__(self, other):
+    def __mul__(self, other: 'RealNumber | Vector3') -> 'Vector3':
         """
-        点乘法。包括点乘和数乘。
-        V * V -> float\n
+        数组运算 非点乘。点乘使用@，叉乘使用cross。
         Args:
             other:
+
         Returns:
-            float
-        Raises:
-            TypeError: 不支持的类型
         """
-        if isinstance(other, (int, float)):
+        if isinstance(other, RealNumber):
             return Vector3(self.x * other, self.y * other, self.z * other)
         elif isinstance(other, Vector3):
-            return self.x * other.x + self.y * other.y + self.z * other.z
+            return Vector3(self.x * other.x, self.y * other.y, self.z * other.z)
         else:
             raise TypeError(f"unsupported operand type(s) for *: 'Vector3' and '{type(other)}'")
 
-    def __rmul__(self, other: float) -> 'Vector3':
-        """
-        右乘。
-        Args:
-            other:
-        Returns:
-            乘积
-        """
+    def __rmul__(self, other: RealNumber) -> 'Vector3':
         return Vector3(self.x * other, self.y * other, self.z * other)
 
-    def __matmul__(self, other: 'Vector3') -> 'Vector3':
+    def __matmul__(self, other: 'Vector3') -> float:
         """
-        向量积 叉乘：V1 @ V2 -> V3
+        点乘。
         Args:
             other:
         Returns:
-            叉乘结果，为0向量则两向量平行，否则垂直于两向量
         """
-        return Vector3(self.y * other.z - self.z * other.y,
-                       self.z * other.x - self.x * other.z,
-                       self.x * other.y - self.y * other.x)
+        return self.x * other.x + self.y * other.y + self.z * other.z
 
-    def __truediv__(self, other: float) -> 'Vector3':
+    def __truediv__(self, other: RealNumber) -> 'Vector3':
         return Vector3(self.x / other, self.y / other, self.z / other)
 
     def __neg__(self):
@@ -208,3 +216,16 @@ class Vector3:
 
     def __str__(self):
         return f"Vector3({self.x}, {self.y}, {self.z})"
+
+
+zero_vector3 = Vector3(0, 0, 0)
+"""零向量"""
+x_axis = Vector3(1, 0, 0)
+"""x轴单位向量"""
+y_axis = Vector3(0, 1, 0)
+"""y轴单位向量"""
+z_axis = Vector3(0, 0, 1)
+"""z轴单位向量"""
+
+v1: Vector3 = Vector3(1, 2, 3) * 3.0
+v2: Vector3 = 3.0 * Vector3(1, 2, 3)
diff --git a/py.typed b/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..ef3a892
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,23 @@
+[project]
+name = "mbcp"
+version = "0.1.0"
+description = "A tool for Minecraft particle production"
+authors = [
+    {name = "snowykami", email = "snowykami@outlook.com"},
+]
+dependencies = [
+    "pytest~=8.3.2",
+    "numpy~=2.0.1",
+    "liteyukibot>=6.3.9",
+]
+requires-python = ">=3.10"
+readme = "README.md"
+license = {text = "MIT"}
+
+[build-system]
+requires = ["pdm-backend"]
+build-backend = "pdm.backend"
+
+
+[tool.pdm]
+distribution = true
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index a2325b4..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-pytest~=8.3.2
-numpy~=2.0.1
\ No newline at end of file
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/answer.py b/tests/answer.py
new file mode 100644
index 0000000..4d67b07
--- /dev/null
+++ b/tests/answer.py
@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+"""
+Copyright (C) 2020-2024 LiteyukiStudio. All Rights Reserved 
+
+@Time    : 2024/8/27 下午1:03
+@Author  : snowykami
+@Email   : snowykami@outlook.com
+@File    : .answer.py
+@Software: PyCharm
+"""
+from liteyuki.log import logger  # type: ignore
+
+
+def output_answer(correct_ans, actual_ans, question: str = None):
+    """
+    输出答案
+    Args:
+        correct_ans:
+        actual_ans:
+        question:
+
+    Returns:
+
+    """
+    print("")
+    if question is not None:
+        logger.info(f"问题：{question}")
+    r = correct_ans == actual_ans
+    if r:
+        logger.success(f"测试正确    正确答案：{correct_ans}    实际答案：{actual_ans}")
+    else:
+        logger.error(f"测试错误    正确答案：{correct_ans}    实际答案：{actual_ans}")
diff --git a/tests/test_line3.py b/tests/test_line3.py
index 9ea3c3c..7388e5f 100644
--- a/tests/test_line3.py
+++ b/tests/test_line3.py
@@ -13,21 +13,8 @@ import logging
 from mbcp.mp_math.point import Point3
 from mbcp.mp_math.vector import Vector3
 from mbcp.mp_math.line import Line3
+from tests.answer import output_answer
 
 
-class TestLine3:
-
-    def test_point_and_normal_factory(self):
-        """
-        测试通过点和法向量构造直线
-        """
-        correct_ans = Line3(1, -2, 3, -8)
-
-        p = Point3(2, -3, 0)
-        n = Vector3(1, -2, 3)
-
-        actual_ans = Line3.from_point_and_direction(p, n)
-        logging.info(f"正确答案：{correct_ans}    实际答案：{actual_ans}")
-        assert actual_ans == correct_ans
 
 
diff --git a/tests/test_plane3.py b/tests/test_plane3.py
index 2729177..4212701 100644
--- a/tests/test_plane3.py
+++ b/tests/test_plane3.py
@@ -12,6 +12,8 @@ import logging
 
 from mbcp.mp_math.line import Line3
 from mbcp.mp_math.plane import Plane3
+from mbcp.mp_math.point import Point3
+from mbcp.mp_math.vector import Vector3
 
 
 class TestPlane3:
@@ -20,10 +22,10 @@ class TestPlane3:
         """
         测试平面的交线
         """
-        correct_ans = Line3(4, 3, 1, 1)
+        correct_ans = Line3(Point3(-3, 2, 5), Vector3(4, 3, 1))
 
         pl1 = Plane3(1, 0, -4, 23)
         pl2 = Plane3(2, -1, -5, 33)
-        actual_ans = pl1.cal_intersection_line3(pl2)
+        actual_ans = pl1 & pl2  # 平面交线
         logging.info(f"正确答案：{correct_ans}    实际答案：{actual_ans}")
         assert actual_ans == correct_ans
diff --git a/tests/test_vector3.py b/tests/test_vector3.py
index e7f737e..66acead 100644
--- a/tests/test_vector3.py
+++ b/tests/test_vector3.py
@@ -12,6 +12,8 @@ import logging
 
 from mbcp.mp_math.vector import Vector3
 
+from tests.answer import output_answer
+
 
 class TestVector3:
 
@@ -23,7 +25,7 @@ class TestVector3:
         """
         v1 = Vector3(1, 2, 3)
         v2 = Vector3(3, 4, 5)
-        actual_ans = v1 @ v2
+        actual_ans = v1.cross(v2)
         correct_ans = Vector3(-2, 4, -2)
         logging.info(f"正确答案{correct_ans}    实际答案{v1 @ v2}")
 
@@ -34,18 +36,20 @@ class TestVector3:
         测试判断向量是否平行
         Returns:
         """
+        """小题1"""
+        correct_ans = True
         v1 = Vector3(1, 2, 3)
         v2 = Vector3(3, 6, 9)
         actual_ans = v1.is_parallel(v2)
-        correct_ans = True
-        logging.info("v1和v2是否平行：%s", v1.is_parallel(v2))
+        output_answer(correct_ans, actual_ans)
         assert correct_ans == actual_ans
 
+        """小题2"""
+        correct_ans = False
         v1 = Vector3(1, 2, 3)
         v2 = Vector3(3, 6, 8)
         actual_ans = v1.is_parallel(v2)
-        correct_ans = False
-        logging.info("v1和v2是否平行：%s", v1.is_parallel(v2))
+        output_answer(correct_ans, actual_ans)
         assert correct_ans == actual_ans
 
 
diff --git a/tests/test_word_problem.py b/tests/test_word_problem.py
index 72f09b5..56d5ad2 100644
--- a/tests/test_word_problem.py
+++ b/tests/test_word_problem.py
@@ -2,11 +2,12 @@
 """
 应用题测试集
 """
-import logging
-
+from liteyuki.log import logger  # type: ignore
 from mbcp.mp_math.line import Line3
 from mbcp.mp_math.plane import Plane3
 from mbcp.mp_math.point import Point3
+from mbcp.mp_math.vector import Vector3
+from .answer import output_answer
 
 
 class TestWordProblem:
@@ -16,17 +17,17 @@ class TestWordProblem:
         同济大学《高等数学》第八版 下册 第八章第四节例4
         问题：求与两平面x-4z-3=0和2x-y-5z-1=0的交线平行且过点(-3, 2, 5)的直线方程。
         """
-        correct_ans = Line3(4, 3, 1, 1)
-
+        question = "求与两平面x-4z-3=0和2x-y-5z-1=0的交线平行且过点(-3, 2, 5)的直线方程。"
+        correct_ans = Line3(Point3(-3, 2, 5), Vector3(4, 3, 1))
         pl1 = Plane3(1, 0, -4, -3)
         pl2 = Plane3(2, -1, -5, -1)
         p = Point3(-3, 2, 5)
         """解法1"""
         # 求直线方向向量s
-        s = pl1.normal @ pl2.normal
-        actual_ans = Line3.from_point_and_direction(p, s)
+        s = pl1.normal.cross(pl2.normal)
+        actual_ans = Line3(p, s)
 
-        logging.info(f"正确答案：{correct_ans}    实际答案：{actual_ans}")
+        output_answer(correct_ans, actual_ans, question)
         assert actual_ans == correct_ans
 
         """解法2"""
@@ -36,8 +37,40 @@ class TestWordProblem:
         pl4 = pl2.cal_parallel_plane3(p)
         # 求pl3和pl4的交线
         actual_ans = pl3.cal_intersection_line3(pl4)
-        print(pl3, pl4, actual_ans)
 
-        logging.info(f"正确答案：{correct_ans}    实际答案：{actual_ans}")
+        output_answer(correct_ans, actual_ans, question)
         assert actual_ans == correct_ans
 
+    def test_c8s4e5(self):
+        """
+        同济大学《高等数学》第八版 下册 第八章第四节例5
+
+        求直线(x-2)/1=(y-3)/1=(z-4)/2与平面2x+y+z-6=0的交点。
+        """
+        question = "求直线(x-2)/1=(y-3)/1=(z-4)/2与平面2x+y+z-6=0的交点。"
+        """正确答案"""
+        correct_ans = Point3(1, 2, 2)
+        """题目已知量"""
+        line = Line3(Point3(2, 3, 4), Vector3(1, 1, 2))
+        plane = Plane3(2, 1, 1, -6)
+
+        """解"""
+        actual_ans = plane & line
+        output_answer(correct_ans, actual_ans, question)
+
+    def test_c8s4e6(self):
+        question = "求过点(2, 3, 1)且与直线(x+1)/3 = (y-1)/2 = z/-1垂直相交的直线的方程。"
+        """正确答案"""
+        correct_ans = Line3(Point3(2, 1, 3), Vector3(2, -1, 4))
+        """题目已知量"""
+        point = Point3(2, 3, 1)
+        line = Line3(Point3(-1, 1, 0), Vector3(3, 2, -1))
+
+        """解"""
+        # 先作平面过点且垂直与已知直线
+        pl = line.cal_perpendicular(point)
+        logger.debug(line.get_point(1))
+
+        # output_answer(correct_ans, actual_ans, question)
+
+