diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
new file mode 100644
index 0000000..11aa958
--- /dev/null
+++ b/.github/workflows/pytest.yml
@@ -0,0 +1,23 @@
+name: pytest
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+    contents: write
+
+jobs:
+  RunTest:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Run pytest
+        uses: pavelzw/pytest-action@v2
+        with:
+          verbose: true
+          emoji: true
+          job-summary: true
+          custom-arguments: '-q'
+          click-to-expand: true
+          report-title: 'Test Report'
\ No newline at end of file
diff --git a/mbcp/mp_math/angle.py b/mbcp/mp_math/angle.py
index 6240b96..2cd02ec 100644
--- a/mbcp/mp_math/angle.py
+++ b/mbcp/mp_math/angle.py
@@ -12,6 +12,7 @@ import math
 from typing import overload
 
 from .const import PI  # type: ignore
+from .utils import approx
 
 
 class AnyAngle:
@@ -129,12 +130,21 @@ class AnyAngle:
     def __add__(self, other: 'AnyAngle') -> 'AnyAngle':
         return AnyAngle(self.radian + other.radian, is_radian=True)
 
+    def __eq__(self, other):
+        return approx(self.radian, other.radian)
+
     def __sub__(self, other: 'AnyAngle') -> 'AnyAngle':
         return AnyAngle(self.radian - other.radian, is_radian=True)
 
     def __mul__(self, other: float) -> 'AnyAngle':
         return AnyAngle(self.radian * other, is_radian=True)
 
+    def __repr__(self):
+        return f"AnyAngle({self.radian}, is_radian=True)"
+
+    def __str__(self):
+        return f"AnyAngle({self.degree}° or {self.radian} rad)"
+
     @overload
     def __truediv__(self, other: float) -> 'AnyAngle':
         ...
diff --git a/mbcp/mp_math/line.py b/mbcp/mp_math/line.py
index 9fdde2d..c108d9a 100644
--- a/mbcp/mp_math/line.py
+++ b/mbcp/mp_math/line.py
@@ -64,14 +64,23 @@ class Line3:
         Returns:
             距离
         Raises:
-            ValueError: 直线不平行
             TypeError: 不支持的类型
         """
         if isinstance(other, Line3):
-            if self.is_parallel(other):
-                return (self.point - other.point).cross(self.direction).length / self.direction.length
+            # 相交/重合 = 0；平行和异面需要计算距离
+            if self == other:
+                # 重合
+                return 0
+            elif self.is_parallel(other):
+                # 平行
+                return (other.point - self.point).cross(self.direction).length / self.direction.length
+            elif not self.is_coplanar(other):
+                # 异面
+                return abs(self.direction.cross(other.direction) @ (self.point - other.point) / self.direction.cross(other.direction).length)
             else:
-                raise ValueError("Lines are not parallel.")
+                # 相交
+                return 0
+
         elif isinstance(other, Point3):
             return (other - self.point).cross(self.direction).length / self.direction.length
         else:
diff --git a/mbcp/mp_math/vector.py b/mbcp/mp_math/vector.py
index 7e1c168..b82b732 100644
--- a/mbcp/mp_math/vector.py
+++ b/mbcp/mp_math/vector.py
@@ -6,10 +6,11 @@ import numpy as np
 from .const import APPROX
 from .mp_math_typing import RealNumber
 from .point import Point3
+from .angle import AnyAngle
 from .utils import approx
 
-if TYPE_CHECKING:
-    from .angle import AnyAngle
+# if TYPE_CHECKING:
+#
 
 
 class Vector3:
@@ -50,6 +51,10 @@ class Vector3:
     def cross(self, other: 'Vector3') -> 'Vector3':
         """
         向量积 叉乘：v1 cross v2 -> v3
+
+        叉乘为0，则两向量平行。
+        其余结果的模为平行四边形的面积。
+
         返回如下行列式的结果：
 
         ``i  j  k``
diff --git a/tests/test_angle.py b/tests/test_angle.py
new file mode 100644
index 0000000..f0943e8
--- /dev/null
+++ b/tests/test_angle.py
@@ -0,0 +1,35 @@
+# -*- coding: utf-8 -*-
+"""
+Copyright (C) 2020-2024 LiteyukiStudio. All Rights Reserved 
+
+@Time    : 2024/8/28 上午3:16
+@Author  : snowykami
+@Email   : snowykami@outlook.com
+@File    : test_angle.py
+@Software: PyCharm
+"""
+from mbcp.mp_math.angle import AnyAngle
+from mbcp.mp_math.const import PI
+from tests.answer import output_ans
+
+
+class TestAngle:
+    def test_radian_to_degree(self):
+        angle = AnyAngle(1, is_radian=True)
+        output_ans(180 / PI, angle.degree, question="弧度转角度1")
+
+        angle = AnyAngle(2, is_radian=True)
+        output_ans(360 / PI, angle.degree, question="弧度转角度2")
+
+        angle = AnyAngle(PI, is_radian=True)
+        output_ans(180, angle.degree, question="弧度转角度3")
+
+    def test_degree_to_radian(self):
+        angle = AnyAngle(180)
+        output_ans(PI, angle.radian, question="角度转弧度1")
+
+        angle = AnyAngle(360)
+        output_ans(2 * PI, angle.radian, question="角度转弧度2")
+
+        angle = AnyAngle(90)
+        output_ans(PI / 2, angle.radian, question="角度转弧度3")
diff --git a/tests/test_line3.py b/tests/test_line3.py
index 26516c0..c2ab133 100644
--- a/tests/test_line3.py
+++ b/tests/test_line3.py
@@ -10,7 +10,12 @@ Copyright (C) 2020-2024 LiteyukiStudio. All Rights Reserved
 """
 import logging
 
+from liteyuki import logger  # type: ignore
+
+from mbcp.mp_math.angle import AnyAngle
+from mbcp.mp_math.const import PI
 from mbcp.mp_math.point import Point3
+from mbcp.mp_math.utils import approx
 from mbcp.mp_math.vector import Vector3
 from mbcp.mp_math.line import Line3
 from tests.answer import output_ans
@@ -18,6 +23,68 @@ from tests.answer import output_ans
 
 class TestLine3:
 
+    def test_cal_angle(self) -> None:
+        """
+        计算两条直线的夹角
+        """
+        """测试样例们"""
+        samples: tuple[tuple[Line3, Line3, AnyAngle], ...] = (
+                (
+                        Line3(Point3(0, 0, 0), Vector3(1, 1, 0)),
+                        Line3(Point3(0, 0, 0), Vector3(1, 0, 0)),
+                        AnyAngle(45)
+                ),
+                (
+                        Line3(Point3(0, 0, 0), Vector3(0, 1, 0)),
+                        Line3(Point3(0, 0, 0), Vector3(1, 0, 0)),
+                        AnyAngle(90)
+                )
+        )
+
+        for sample in samples:
+            correct_ans = sample[2]
+            actual_ans = sample[0].cal_angle(sample[1])
+            output_ans(correct_ans, actual_ans, question="计算两条直线的夹角")
+            assert correct_ans == actual_ans
+
+    def test_cal_distance(self) -> None:
+        """
+        计算两条直线的距离
+        """
+        """测试样例们"""
+        samples: tuple[tuple[Line3, Line3, float], ...] = (
+                (  # 重合
+                        Line3(Point3(0, 0, 0), Vector3(1, 1, 1)),
+                        Line3(Point3(0, 0, 0), Vector3(2, 2, 2)),
+                        0
+                ),
+                (  # 两条直线相交
+                        Line3(Point3(0, 0, 0), Vector3(1, 1, 0)),
+                        Line3(Point3(0, 0, 0), Vector3(1, 0, 0)),
+                        0
+                ),
+                (  # 平行线
+                        Line3.from_two_points(Point3(0, 0, 0), Point3(1, 1, 0)),
+                        Line3.from_two_points(Point3(0, 0, 1), Point3(1, 1, 1)),
+                        1
+                ),
+                (   # 异面
+                        Line3.from_two_points(Point3(0, 0, 0), Point3(1, 1, 0)),
+                        Line3.from_two_points(Point3(1, 0, 2), Point3(0, 1, 2)),
+                        2
+                ),
+                (   # 异面2
+                        Line3.from_two_points(Point3(1, 0, 1), Point3(2, 1 ,0)),
+                        Line3.from_two_points(Point3(1, 2, 0), Point3(0, 1, 1)),
+                        2 ** 0.5
+                )
+        )
+
+        for sample in samples:
+            correct_ans = sample[2]
+            actual_ans = sample[0].cal_distance(sample[1])
+            output_ans(correct_ans, actual_ans,approx(correct_ans, actual_ans), question="计算两条直线的距离")
+
     def test_equal(self):
         line1 = Line3(Point3(1, 1, 1), Vector3(1, 1, 1))
         line2 = Line3(Point3(1, 1, 1), Vector3(2, 2, 2))
@@ -25,7 +92,7 @@ class TestLine3:
 
         # 反例
         line1 = Line3(Point3(1, 1, 1), Vector3(1, 1, 1))
-        line2 = Line3(Point3(1, 1, 1), Vector3(2, 2, 2.000000001))
+        line2 = Line3(Point3(1, 1, 1), Vector3(2, 2, 2.1))
         output_ans(False, line1 == line2, question="判断两条直线是否不相等")
 
     def test_approx(self):
diff --git a/tests/test_vector3.py b/tests/test_vector3.py
index a4abd6e..d4fcec8 100644
--- a/tests/test_vector3.py
+++ b/tests/test_vector3.py
@@ -10,6 +10,8 @@ Copyright (C) 2020-2024 LiteyukiStudio. All Rights Reserved
 """
 import logging
 
+from mbcp.mp_math.angle import AnyAngle
+from mbcp.mp_math.const import PI
 from mbcp.mp_math.vector import Vector3
 
 from tests.answer import output_ans
@@ -18,6 +20,26 @@ from tests.answer import output_ans
 class TestVector3:
 
     """测试问题集"""
+    def test_cal_angle(self):
+        """
+        测试计算两个向量的夹角
+        Returns:
+        """
+        """小题1"""
+        v1 = Vector3(0 ,1, 0)
+        v2 = Vector3(0, 0, 1)
+        correct_ans = AnyAngle(90)
+        actual_ans = v1.cal_angle(v2)
+        output_ans(correct_ans, actual_ans)
+
+        """小题2"""
+        v1 = Vector3(0, 1, 0)
+        v2 = Vector3(1, 1, 0)
+        correct_ans = AnyAngle(45)
+        actual_ans = v1.cal_angle(v2)
+        output_ans(correct_ans, actual_ans)
+
+
     def test_vector_cross_product(self):
         """
         测试向量叉乘