diff --git a/bodies/jupiter_system/README.md b/bodies/jupiter_system/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..0f03bd87fdb7954756c1be60f7a4198abf38d7d6
--- /dev/null
+++ b/bodies/jupiter_system/README.md
@@ -0,0 +1,13 @@
+### 数字 0-9 上标小数字特殊符号
+```python
+    # ⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹
+    # 　逃逸速度: 
+    # 　公转速度: 
+    # 　天体质量: 
+    # 　平均密度: 
+```
+参考：
+https://www.explanet.info/Chapter09.htm
+
+
+
diff --git a/bodies/jupiter_system/callisto.py b/bodies/jupiter_system/callisto.py
index b3fb392a5eaf93aea7246986a2cb7acb2356d268..385ddc84ce95944aa6505c292c309e4efe0cbdd4 100644
--- a/bodies/jupiter_system/callisto.py
+++ b/bodies/jupiter_system/callisto.py
@@ -26,12 +26,12 @@ class Callisto(Body):
 
     　逃逸速度:
     　天体质量: 1.08 x 10²³ kg
-    　平均密度:  g/cm³ -> ✕10³ kg/m³
+    　平均密度: 1.83 g/cm³ -> 1.83✕10³ kg/m³
     """
 
     def __init__(self, name="木卫四", mass=1.08e23,
                  init_position=[0, 0, 1880000],
-                 init_velocity=[8.15, 0, 0],
+                 init_velocity=[-8.15, 0, 0],
                  texture="jupiter_callisto.jpg", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=0.25, ignore_mass=False,
                  trail_color=None, show_name=False,
@@ -56,7 +56,7 @@ class Callisto(Body):
             "mass": mass,
             "init_position": init_position,
             "init_velocity": init_velocity,
-            "density": 3.014e3,
+            "density": 1.83e3,
             "color": (162, 162, 162),
             "texture": texture,
             "size_scale": size_scale,
diff --git a/bodies/jupiter_system/europa.py b/bodies/jupiter_system/europa.py
index 3ce5d2707055bb2cfa9593c18ee39241567e1b4a..bf34eeafa8ff24f22c862379ac43ea3936614b19 100644
--- a/bodies/jupiter_system/europa.py
+++ b/bodies/jupiter_system/europa.py
@@ -82,7 +82,7 @@ zero
 
     def __init__(self, name="木卫二", mass=4.80e22,
                  init_position=[0, 0, 670900],
-                 init_velocity=[13.741, 0, 0],
+                 init_velocity=[-13.741, 0, 0],
                  texture="jupiter_europa.jpg", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=0.25, ignore_mass=False,
                  trail_color=None, show_name=False,
diff --git a/bodies/jupiter_system/ganymede.py b/bodies/jupiter_system/ganymede.py
index ed901fb262041719b70219066cfcdb4ed48d44c9..3b2092a0fc71ad1377ecabf26554b3603dfb6a32 100644
--- a/bodies/jupiter_system/ganymede.py
+++ b/bodies/jupiter_system/ganymede.py
@@ -59,7 +59,7 @@ class Ganymede(Body):
 
     def __init__(self, name="木卫三", mass=1.4819e23,
                  init_position=[0, 0, 1069200],
-                 init_velocity=[10.880, 0, 0],
+                 init_velocity=[-10.880, 0, 0],
                  texture="jupiter_ganymede.jpg", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=0.25, ignore_mass=False,
                  trail_color=None, show_name=False,
diff --git a/bodies/jupiter_system/io.py b/bodies/jupiter_system/io.py
index f553f82f079079cae62b81c8636466cc57d4719a..74aa67659f9986ea6f37e23b6bde530753c01101 100644
--- a/bodies/jupiter_system/io.py
+++ b/bodies/jupiter_system/io.py
@@ -50,7 +50,7 @@ class Io(Body):
 
     def __init__(self, name="木卫一", mass=8.9319e22,
                  init_position=[0, 0, 420000],
-                 init_velocity=[17.334, 0, 0],
+                 init_velocity=[-17.334, 0, 0],
                  texture="jupiter_io.jpg", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=0.25, ignore_mass=False,
                  trail_color=None, show_name=False,
diff --git a/sim_scenes/solar_system/jupiter_system.py b/sim_scenes/solar_system/jupiter_system.py
index 304f16337ec8ca1cd5dfc74f1195244f52678ab4..7533d0439d501db11ee1e8b9015f913b4a568c80 100644
--- a/sim_scenes/solar_system/jupiter_system.py
+++ b/sim_scenes/solar_system/jupiter_system.py
@@ -9,24 +9,34 @@
 from bodies import Sun, Earth, Jupiter
 from bodies.jupiter_system import Io, Europa, Ganymede, Callisto
 from common.consts import SECONDS_PER_HOUR, SECONDS_PER_DAY, AU
-from sim_scenes.func import mayavi_run, ursina_run
+from sim_scenes.func import mayavi_run, ursina_run, camera_look_at
+from simulators.ursina.ursina_event import UrsinaEvent
 
 if __name__ == '__main__':
     """
     太阳、地球、木星
     """
     bodies = [
+        Jupiter(size_scale=1, init_velocity=[0, 0, 0], init_position=[0, 0, 0]),
         Io(size_scale=1e1),
         Europa(size_scale=1e1),
         Ganymede(size_scale=1e1),
         Callisto(size_scale=1e1),
-        Jupiter(size_scale=1, init_velocity=[0, 0, 0], init_position=[0, 0, 0]),  # 木星放大 500 倍，距离保持不变
     ]
+    jupiter = bodies[0]
 
-    # 使用 mayavi 查看的运行效果
-    # mayavi_run(bodies, SECONDS_PER_WEEK, view_azimuth=-45)
+
+    def on_ready():
+        camera_look_at(jupiter)
+        pass
+
+
+    UrsinaEvent.on_ready_subscription(on_ready)
 
     # 使用 ursina 查看的运行效果
     # 常用快捷键： P：运行和暂停  O：重新开始  I：显示天体轨迹
     # position = 左-右+、上+下-、前+后-
-    ursina_run(bodies, SECONDS_PER_HOUR, position=(0, 0, -AU/100), show_trail=True, view_closely=True)
+    ursina_run(bodies, SECONDS_PER_DAY,
+               position=(0, AU / 25, 0),
+               show_trail=True,
+               view_closely=True)