diff --git a/bin/configs.py b/bin/configs.py
index a45e931..4c0943d 100644
--- a/bin/configs.py
+++ b/bin/configs.py
@@ -6,40 +6,41 @@ mail: 3695888@qq.com
 import re
 import bin
 import time
+import json5
 import decimal
 
 
 def basic_number(int_num=0, float_num=1, unit1=None, unit2=None) -> list:
-    """
-
-    :param unit2: list
-    :param unit1: list
-    :param int_num: int
-    :type float_num: decimal.Decimal or float
-    """
     if unit1 is None:
         unit1 = []
     if unit2 is None:
         unit2 = []
-    if bin.tools.is_decimal(float_num):
-        return [int_num, float_num, unit1, unit2]
+    if bin.tools.is_decimal(float_num):  # is decimal class?
+        return [int_num, float_num, unit1, unit2]  # is just return
     else:
-        return [int_num, decimal.Decimal(str(float_num)), unit1, unit2]
+        return [int_num, decimal.Decimal(str(float_num)), unit1, unit2]  # no create a decimal class
 
 
 def basic_force() -> list:
     return [basic_number(unit1=["N"]), basic_number(unit1=["N"])]
 
 
-def configs(name) -> dict:
-    pass
+def configs(name, option=None) -> dict:
+    with open(name, 'r') as file:
+        data = json5.load(file)
+        if option:
+            try:
+                data = data[option]
+            except:
+                print(Exception)
+                raise Exception
 
 
 def name_handler(name: str, configs: dict = None) -> str:
     if configs is None:
         return name
     for need_replace in configs:
-        if need_replace == '{date}':
+        if need_replace == '{date}':  # special replace
             replace = time.strftime(configs[need_replace], time.gmtime(time.time()))
             name.replace(need_replace, replace)
         name.replace(need_replace, configs[need_replace])
diff --git a/bin/tools.py b/bin/tools.py
index 768e3ca..ebc5fdb 100644
--- a/bin/tools.py
+++ b/bin/tools.py
@@ -27,10 +27,10 @@ Physics calculation
 
 
 def is_decimal(A: any) -> bool:
-    if type(A) == type(decimal.Decimal):
-        return True
-    else:
+    if type(A) != type(decimal.Decimal):
         return False
+    else:
+        return True
 
 
 def F_D(A: decimal, B: decimal) -> decimal:
@@ -38,8 +38,19 @@ def F_D(A: decimal, B: decimal) -> decimal:
         return A / B
 
 
-def F_Mu():
-    pass
+def F_Mu(A: decimal, B: decimal) -> decimal:
+    if is_decimal(A) and is_decimal(B):
+        return A * B
+
+
+def F_Mi(A: decimal, B: decimal) -> decimal:
+    if is_decimal(A) and is_decimal(B):
+        return A - B
+
+
+def F_A(A: decimal, B: decimal) -> decimal:
+    if is_decimal(A) and is_decimal(B):
+        return A + B
 
 
 def D_C(listA: list, listB: list) -> '1':  # stand for Duplicate check
@@ -60,7 +71,7 @@ def D_C(listA: list, listB: list) -> '1':  # stand for Duplicate check
     return 1
 
 
-def S_C_float_check(SC) -> dict:  # stand for Scientific notation's float check
+def S_C_float_check(SC) -> None:  # stand for Scientific notation's float check
     """
     formats:
     SC list format:docs.basic_config.json:basic_number"""
@@ -94,7 +105,7 @@ def __S_N_M(A, B):
     R = [F_Mu(A[0], B[0]), A[1] + B[1]]
     S_C_float_check(R)
     Unit1, Unit2 = A[2] + B[2], A[3] + B[3]
-    if Unit1 == None:
+    if Unit1 is None:
         Unit1 = []
     D_C(Unit1, Unit2)
     R += [Unit1, Unit2]