diff --git a/simulators/ursina/entities/body_trail.py b/simulators/ursina/entities/body_trail.py
index 2e6d88ea0a2f7030edfd30aa442f131e3a5f5b2f..ee7405366929f27f9feb3a592a229f6a3767adac 100644
--- a/simulators/ursina/entities/body_trail.py
+++ b/simulators/ursina/entities/body_trail.py
@@ -7,7 +7,7 @@
 # python_version  :3.8
 # ==============================================================================
 # pip install -i http://pypi.douban.com/simple/ --trusted-host=pypi.douban.com ursina
-from ursina import Entity, Mesh, Text, color, destroy
+from ursina import Entity, Mesh, Text, color, destroy, Vec3
 
 from simulators.ursina.ursina_config import UrsinaConfig
 
@@ -48,10 +48,16 @@ class BodyTrail(Entity):
         verts_acc = [(0, 0, 0), tuple(acc_direction)]
         verts_vel = [(0, 0, 0), tuple(vel_direction)]
 
+        # acc_arrow = Arrow(parent=self,from_pos=Vec3((0, 0, 0)), to_pos=Vec3(tuple(acc_direction)),color=color.yellow, alpha=0.5)
+        # acc_arrow.set_light_off()
+        
         acc_line = Entity(parent=self, model=Mesh(vertices=verts_acc, mode='line', thickness=3),
                           color=color.yellow, alpha=0.5)
         acc_line.set_light_off()
 
+        # vel_arrow = Arrow(parent=self,from_pos=Vec3((0, 0, 0)), to_pos=Vec3(tuple(vel_direction)),color=color.red, alpha=0.5)
+        # vel_arrow.set_light_off()
+
         vel_line = Entity(parent=self, model=Mesh(vertices=verts_vel, mode='line', thickness=3),
                           color=color.red, alpha=0.5)
         vel_line.set_light_off()
@@ -65,3 +71,62 @@ class BodyTrail(Entity):
                         font=UrsinaConfig.CN_FONT, background=False, color=color.yellow,
                         position=acc_position, alpha=0.5)
         acc_text.set_light_off()
+
+
+
+class Arrow(Entity):
+    def __init__(self, parent, from_pos=(0, 0, 0), to_pos=(1, 0, 0), **kwargs):
+        from_pos=to_pos/2
+        super().__init__(parent=parent, model='arrow', position=from_pos, **kwargs)
+        # self.x = -pos[1]
+        # self.y = pos[2]
+        # self.z = pos[0]
+        to_pos=1000*to_pos
+        # to_pos = -to_pos[2],-to_pos[1],to_pos[0]
+        # to_pos = -to_pos[2],-to_pos[0],to_pos[1]
+        # to_pos = to_pos[0],to_pos[2],to_pos[1]
+        # to_pos = -to_pos[0],to_pos[1],to_pos[2]
+        # to_pos = to_pos[1], -to_pos[0], -to_pos[2]
+        # to_pos = to_pos[1], -to_pos[0], -to_pos[2]
+        self.rotation=(0,0,0)
+        self.look_at(to_pos)
+        print(self.rotation)
+        # self.model = Mesh(vertices=[
+        #     from_pos,
+        #     from_pos + (to_pos - from_pos) * 0.9,
+        #     from_pos + (to_pos - from_pos) * 0.9 + Vec3(0, 0.1, 0),
+        #     to_pos,
+        #     from_pos + (to_pos - from_pos) * 0.9 - Vec3(0, 0.1, 0),
+        #     from_pos + (to_pos - from_pos) * 0.9
+        # ], mode='triangle', thickness=thickness)
+        #
+        # self.color = color
+        # self.look_at(to_pos)
+        # self.scale_z = (to_pos - from_pos).length()
+
+
+# class Arrow(Entity):
+#     def __init__(self,parent, from_pos, to_pos, **kwargs):
+#         super().__init__(parent=parent, model='arrow', **kwargs)
+#         self.position = from_pos
+#         self.look_at(to_pos)
+
+
+
+# import numpy as np
+# def draw_arrow(parent, from_pos, to_pos, color, alpha):
+#     # 计算方向向量和长度
+#     p1 = np.array(from_pos)
+#     p2 = np.array(to_pos)
+#     direction = p2 - p1
+#     length = np.linalg.norm(direction)
+#
+#     # 创建箭头实体
+#     arrow = Entity(parent=parent, model="arrow", scale=(1, 1, length),color=color,alpha=alpha)
+#
+#     # 设置箭头位置和方向
+#     arrow_position = p1 + direction/2
+#     arrow.position = arrow_position
+#     arrow.look_at(p2)
+#
+#     return arrow
\ No newline at end of file
diff --git a/simulators/ursina/entities/planet.py b/simulators/ursina/entities/planet.py
index 83ce810646a8b998fa98a4f943d10668d50f18ba..e0e18af2a5aaa3d6b18d908295f472db25b0fee3 100644
--- a/simulators/ursina/entities/planet.py
+++ b/simulators/ursina/entities/planet.py
@@ -109,6 +109,7 @@ class Planet(Entity):
 
         pos = self.body_view.position * UrsinaConfig.SCALE_FACTOR
         if self.body.parent is None:
+            # TODO: ????????
             self.x = -pos[1]
             self.y = pos[2]
             self.z = pos[0]
@@ -175,6 +176,7 @@ class Planet(Entity):
                     self.f_parent = b
                     break
         pos = self.f_parent.position * UrsinaConfig.SCALE_FACTOR
+        # TODO: ????????
         self.x = -pos[1]
         self.y = pos[2]
         self.z = pos[0]
diff --git a/simulators/ursina_simulator.py b/simulators/ursina_simulator.py
index 1bb72ff03d1701f30ae63ec960160bd1673bd7ca..a11bc885383dda601d31638484ac7ef00d65a65f 100644
--- a/simulators/ursina_simulator.py
+++ b/simulators/ursina_simulator.py
@@ -40,13 +40,17 @@ class WorldGrid(Entity):
         s = 100
         grid = Entity(model=Grid(s, s), scale=s * 20, color=color.rgba(255, 255, 255, 20), rotation_x=90,
                       position=(0, -80, 0))
-        # 坐标轴
-        # vertsx = ((0, 0, 0), (10, 0, 0))
-        # Entity(model=Mesh(vertices=vertsx, mode='line', thickness=3), color=color.cyan).set_light_off()
-        # vertsyz = [(0, 0, 0), (0, 10, 0), (0, 0, 0), (0, 0, 10)]
-        # Entity(model=Mesh(vertices=vertsyz, mode='line', thickness=3), color=color.yellow).set_light_off()
         grid.set_light_off()
 
+        # 坐标轴
+        # vertsx = ((0, 0, 0), (10, 0, 0))
+        # Entity(model=Mesh(vertices=vertsx, mode='line', thickness=3), color=color.red).set_light_off()
+        #
+        # vertsy = [(0, 0, 0), (0, 10, 0)]
+        # Entity(model=Mesh(vertices=vertsy, mode='line', thickness=3), color=color.green).set_light_off()
+        #
+        # vertsz = [(0, 0, 0), (0, 0, 10)]
+        # Entity(model=Mesh(vertices=vertsz, mode='line', thickness=3), color=color.blue).set_light_off()
 
 class UrsinaSimulator(Simulator):
     """