diff --git a/configs/basic_config.json b/configs/basic_config.json
index 307d0dc..f3fe533 100644
--- a/configs/basic_config.json
+++ b/configs/basic_config.json
@@ -10,5 +10,8 @@
             "soild": "soild_engine_flame.png",
             "ion": "ion_engine_flame.png"
         }
+    },
+    "basic_number": {
+        "G" : ["6.67", "-11", ["N", "m", "m"], ["kg", "kg"]]
     }
 }
\ No newline at end of file
diff --git a/docs/configes sample/basic_config.json b/docs/configes sample/basic_config.json
index 28c7f6f..cb781d3 100644
--- a/docs/configes sample/basic_config.json	
+++ b/docs/configes sample/basic_config.json	
@@ -8,5 +8,8 @@
         "flame": {
             "xxx": "xxx.png"
         }
+    },
+    "basic_number": {
+        "name" : ["float", "int", ["unit"], ["unit"], "name = float × 10^int × unit(s) ÷ unit(s)"]
     }
 }
\ No newline at end of file
diff --git a/libs/Game_threads/orbit_demo.py b/libs/Game_threads/orbit_demo.py
index e44ef21..89a54d6 100644
--- a/libs/Game_threads/orbit_demo.py
+++ b/libs/Game_threads/orbit_demo.py
@@ -21,3 +21,9 @@ class Orbit_demo(threading.Thread):
         self.this_planet_info = {}
         self.back_ground_element = {}
         self.back_ground_image = ""
+    
+    def main(self):
+        print("ha ?")
+    
+    def orbit_math(self):
+        mass = self.ship_info["mass"]