diff --git a/objs/halley_comet.py b/objs/halley_comet.py
index c19b3e8384d40eaa16fdba3a089502661eebb72a..d6eacddbdab974308f2c441a69062e8bac23aefc 100644
--- a/objs/halley_comet.py
+++ b/objs/halley_comet.py
@@ -18,6 +18,7 @@ class HalleComet(RockSnow):
     远日点: 35.1 AU（2023年12月9日）
     近日点: 0.586 AU 上次通过近日点：1986年2月9日 下次通过近日点：2061年7月28日
     平均密度: 0.6（估计的范围在0.2至1.5g/cm）
+    均密度: 1 g/cm³ -> 1✕10³ kg/m³
     来源：https://www.cgmodel.com/model/500318.html
     """
 
diff --git a/sim_scenes/solar_system/halley_comet_sim.py b/sim_scenes/solar_system/halley_comet_sim.py
index bd7f7793883d50b093c9dfa6ccb03ab3ea3e5d6d..e4071093201aa2e137b93ee9a99a8d205c55a5a4 100644
--- a/sim_scenes/solar_system/halley_comet_sim.py
+++ b/sim_scenes/solar_system/halley_comet_sim.py
@@ -182,7 +182,7 @@ class HalleyCometSim:
         set_solar_system_celestial_position(self.bodies, t, False)
 
     def create_year_label(self, trail, year, halley_comet_pos):
-        label = create_label(trail, label=year, pos=(0,0,0), color=(255, 255, 255), scale=40, alpha=1.0)
+        label = create_label(trail, label=year, pos=(0, 0, 0), color=(255, 255, 255), scale=40, alpha=1.0)
         # label.udpate
         label.set_light_off()
 
@@ -213,14 +213,41 @@ class HalleyCometSim:
                     last_trail.entity_infos["time"] = dt.strftime("%Y-%m-%d")
                     # print(last_trail.entity_infos)
 
+                pos = self.halley_comet.planet.position
+
+                import copy
+
                 if not hasattr(self, "last_year"):
-                    self.create_year_label(last_trail, year, self.halley_comet.planet.position)
+                    self.create_year_label(last_trail, year, pos)
                 elif self.last_year != year:
-                    self.create_year_label(last_trail, year, self.halley_comet.planet.position)
+                    if not hasattr(self, "last_label_pos"):
+                        self.create_year_label(last_trail, year, pos)
+                        self.last_label_pos = copy.deepcopy(self.halley_comet.position)
+                    else:
+                        # 防止标签非常紧密
+                        d = calculate_distance(self.halley_comet.position, self.last_label_pos)
+                        if d > AU:
+                            self.create_year_label(last_trail, year, pos)
+                            self.last_label_pos = copy.deepcopy(self.halley_comet.position)
 
                 self.last_year = year
+                # 哈雷彗星离太阳最近的点称为 "perihelion of Halley's Comet"（近日点：comet_peri），
+
+                if not hasattr(self, "comet_peri"):
+                    self.comet_peri = d_sun
+                elif d_sun < self.comet_peri:
+                    self.comet_peri = d_sun
+
+                # 哈雷彗星离太阳最远的点称为 "aphelion of Halley's Comet"（远日点）
+                if not hasattr(self, "comet_aphel"):
+                    self.comet_aphel = d_sun
+                elif d_sun > self.comet_aphel:
+                    self.comet_aphel = d_sun
+
 
                 panel_text = "哈雷彗星:\n距离太阳：%.3f AU" % (d_sun / AU)
+                panel_text += "\n离日最远：%.3f AU" % (self.comet_aphel / AU)
+                panel_text += "\n离日最近：%.3f AU" % (self.comet_peri / AU)
                 panel_text += "\n距离地球：%.3f AU" % (d_earth / AU)
                 velocity, _ = get_value_direction_vectors(self.halley_comet.velocity)
                 panel_text += "\n当前速度：%.3f km/s" % velocity
@@ -288,4 +315,4 @@ if __name__ == '__main__':
                show_control_info=False,
                timer_enabled=True,
                show_grid=False
-               )
\ No newline at end of file
+               )
diff --git a/simulators/ursina/entities/body_trail.py b/simulators/ursina/entities/body_trail.py
index c1b36ab46db0f2a7560194963a27f2b0e3637f4e..1b5b6e7d30b7050a5018d03d60b8fc8be4746822 100644
--- a/simulators/ursina/entities/body_trail.py
+++ b/simulators/ursina/entities/body_trail.py
@@ -52,9 +52,13 @@ class BodyTrail(Entity):
             # self.origin_color = self.color
             self.origin_alpha = self.alpha
 
-        if len(self.children) > 0:
-            for c in self.children:
+        if not hasattr(self, "info_entities"):
+            self.info_entities = []
+
+        if len(self.info_entities) > 0:
+            for c in self.info_entities:
                 destroy(c)
+            self.info_entities = []
             # self.color = self.origin_color
             self.alpha = self.origin_alpha
             return
@@ -79,28 +83,42 @@ class BodyTrail(Entity):
             acc_info = "%.2fm/s²" % (acc_m)
         elif acc_m >= 0.00001:
             acc_info = "%.2fmm/s²" % (acc_m * 1000)
-        # elif acc_m >= 0.00000001:
-        #     acc_info = "%.2fμm/s²" % (acc_m * 1000 * 1000)
+        elif acc_m >= 0.00000001:
+            acc_info = "%.2fμm/s²" % (acc_m * 1000 * 1000)
         else:
             acc_info = "0m/s²"
 
         if vel_value < 0.00000001:
-            create_label(parent=self, label=vel_info, pos=Vec3(-0.5, -0.5, -0.5), color=color.red).set_light_off()
+            label = create_label(parent=self, label=vel_info, pos=Vec3(-0.5, -0.5, -0.5),
+                                 color=color.red).set_light_off()
+            self.info_entities.append(label)
+            # label.infos = vel_info
             # v_text.parent = self
             # # v_arrow.enabled = False
             # # v_line.enabled = False
         else:
             v_arrow, v_line, v_text = create_arrow_line((0, 0, 0), tuple(vel_direction), parent=self,
                                                         label=vel_info, color=color.red, alpha=0.8, arrow_scale=0.5)
-
-        if acc_m < 0.00001:
-            create_label(parent=self, label=acc_info, pos=Vec3(0.5, 0.5, 0.5), color=color.green).set_light_off()
+            # v_arrow.infos = vel_info
+            # v_line.infos = vel_info
+            # v_text.infos = vel_info
+            self.info_entities += v_arrow, v_line, v_text
+
+        if acc_m < 0.00000001:
+            label = create_label(parent=self, label=acc_info, pos=Vec3(0.5, 0.5, 0.5),
+                                 color=color.green).set_light_off()
+            self.info_entities.append(label)
+            # label.infos = acc_info
             # a_text.parent = self
             # a_arrow.enabled = False
             # a_line.enabled = False
         else:
             a_arrow, a_line, a_text = create_arrow_line((0, 0, 0), tuple(acc_direction), parent=self,
                                                         label=acc_info, color=color.green, alpha=0.8, arrow_scale=0.5)
+            self.info_entities += a_arrow, a_line, a_text
+            # a_arrow.infos = acc_info
+            # a_line.infos = acc_info
+            # a_text.infos = acc_info
 
 
 class BodyTrailLine_OK(Entity):