diff --git a/工具v2/database_tools.py b/工具v2/database_tools.py
index ab4ea995..085b4e9f 100644
--- a/工具v2/database_tools.py
+++ b/工具v2/database_tools.py
@@ -1120,10 +1120,37 @@ def RefineMathpix(raw_string): # 进一步修改mathpix得到的字符串
     string = MergeMathComma(string) #判断非数学环境中的","是否需要合并在一个数学环境中, 如果需要则执行合并
     string = RefineCasesEnv(string) #美化cases环境
     string = RefineChineseComma(string) #改顿号
+    string = RefineInterval(string) #改错误的dollars符号和括号的顺序
     
 
     return string
 
+def RefineInterval(string):
+    newstring = string
+    matches = re.finditer(r"\+\\infty\$\)",newstring) #先处理右括号
+    poslist = [(match.start(),match.end()) for match in matches]
+    poslist.reverse() #从后往前逐一更改
+    for s,e in poslist:
+        leftdollar = newstring[:s].rfind("$")
+        leftbracket = leftdollar-1
+        lb = newstring[leftbracket]
+        if lb in ["[","("]: #如果上一个$前面是括号, 就交换这一对相应的$符号和括号
+            print("$"+lb+newstring[leftbracket+2:e-2] + ")$")
+            newstring = newstring[:leftbracket] + "$"+lb+newstring[leftbracket+2:e-2] + ")$" + newstring[e:]
+    matches = re.finditer(r"\(\$-\\infty",newstring)
+    poslist = [(match.start(),match.end()) for match in matches]
+    poslist.reverse() #从后往前逐一更改
+    for s,e in poslist:
+        print(s,e)
+        rightdollar = newstring[e:].find("$")+e
+        rightbracket = rightdollar+1
+        rb = newstring[rightbracket]
+        if rb in ["]",")"]:
+            print("$("+newstring[s+2:rightbracket-1]+rb+"$")
+            newstring = newstring[:s]+"$("+newstring[s+2:rightbracket-1]+rb+"$"+newstring[rightbracket+1:]
+    newstring = newstring.replace("($-\\infty$, $+\\infty$)","$(-\\infty, +\\infty)$")
+    return newstring
+
 def RefineChineseComma(string): #顿号如果在数学环境中, 则在两侧加上$符号
     CommaPositions = [match.start() for match in re.finditer("、",string)]
     CommaPositions.reverse()