diff --git a/工具v2/database_tools.py b/工具v2/database_tools.py
index 4feeb207..c02fd842 100644
--- a/工具v2/database_tools.py
+++ b/工具v2/database_tools.py
@@ -2170,5 +2170,15 @@ def PaintRedAnswers(string,prodict): #将prodict中已有的答案标红色
     return output
 
 
+def usagelistdifference(lista,listb): #比较两个usage数组的最大差别(绝对值), 数组长度不一致则返回1
+    if len(lista) != len(listb):
+        return 1
+    else:
+        maxdiff = 0
+        for i in range(len(lista)):
+            maxdiff = max(abs(float(lista[i])-float(listb[i])),maxdiff)
+        return maxdiff
+
+
 if __name__ == "__main__":
     print("数据库工具, import用.")
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