diff --git a/libs/Game_threads/__init__.py b/libs/Game_threads/__init__.py
index b49957e..26d0a8f 100644
--- a/libs/Game_threads/__init__.py
+++ b/libs/Game_threads/__init__.py
@@ -5,4 +5,3 @@ mail: 3695888@qq.com
 # import folders
 
 # import in this forder
-from libs.Game_threads import calculations
\ No newline at end of file
diff --git a/libs/Game_threads/calculations.py b/libs/P_C.py
similarity index 58%
rename from libs/Game_threads/calculations.py
rename to libs/P_C.py
index 7cfb1a6..c3da539 100644
--- a/libs/Game_threads/calculations.py
+++ b/libs/P_C.py
@@ -24,14 +24,16 @@ def P_C_M(A, B):  # stand for Physics Calculation multiple
     else:
         Float = float(Float)
         Int = int(Int)
-    Unit1 = A[2].extend(B[2])
+    Unit1 = [].append(A[2].extend(B[2]))
     Unit2 = []
     for unit in B[3]:
-        if unit in Unit1:
+        if unit in [Unit1]:
             n = Unit1.index(unit)
             Unit1.pop(n)
         else:
             Unit2.append(unit)
+    if Unit1 == None:
+        Unit1 = []
     C = [Float, Int, Unit1, Unit2]
     return C
 
@@ -42,4 +44,26 @@ def P_C_D(A, B):  # stand for Physics Calculation divide
     A & B list format:docs.basic_config.json:basic_number
     """
     C = [0.0, 1, [], []]
+    Float = A[0] / B[0]
+    Int = A[1] - B[1]
+    if Float >= 10:
+        Float /= 10
+        Int += 1
+    elif Float <= 0.01:
+        Float *= 10
+        Int -= 1
+    else:
+        Float = float(Float)
+        Int = int(Int)
+    Unit1 = A[2].extend(B[3])
+    Unit2 = []
+    for unit in B[2]:
+        if unit in [Unit1]:
+            n = Unit1.index(unit)
+            Unit1.pop(n)
+        else:
+            Unit2.append(unit)
+    if Unit1 == None:
+        Unit1 = []
+    C = [Float, Int, Unit1, Unit2]
     return C
diff --git a/libs/__init__.py b/libs/__init__.py
index 59d22d8..00cbbb6 100644
--- a/libs/__init__.py
+++ b/libs/__init__.py
@@ -6,8 +6,9 @@ mail: 3695888@qq.com
 import libs.Game_threads
 
 # import in this forder
+import libs.P_C
 import libs.main
 import libs.loads
 import libs.setup
-import libs.render_thread
 import libs.delivery
+import libs.render_thread
diff --git a/test.py b/test.py
new file mode 100644
index 0000000..777f7fb
--- /dev/null
+++ b/test.py
@@ -0,0 +1,19 @@
+"""
+writen by shenjackyuanjie
+mail: 3695888@qq.com
+"""
+
+import libs
+
+
+A = [2.573, 3, ["m", "kg"], ["N", "s"]]
+B = [0.245, -7, ["N", "kg"], ["m", "s"]]
+
+print("A = " , A)
+print("B = " , B)
+
+C = libs.P_C.P_C_M(A, B)
+D = libs.P_C.P_C_D(A, B)
+
+print("A × B = " , C)
+print("A ÷ B = " , D)