diff --git a/lexical_analysis.cpp b/lexical_analysis.cpp
index 7cfbcf4..b92a3a8 100644
--- a/lexical_analysis.cpp
+++ b/lexical_analysis.cpp
@@ -2,13 +2,14 @@
 #include <fstream>
 #include <cstring>
 
-#define SELFDEFINE -1 //自定义标识符 
-#define IDENTIFIER -2 //界符 or 运算符 
-#define NUMBER -3     //数字 
-#define RESERVEWORD -4//关键字 
-#define FAIL   -5     //失败 
-#define SCANEND -6    //扫描完成 
-#define ERRORFOUND -7 //异常错误 
+#define IDENTIFIER  -1 //自定义标识符 
+#define OPERATOR    -2 //界符 or 运算符 
+#define NUMBER      -3 //数字 
+#define RESERVEWORD -4 //关键字 
+#define STRING      -5 //字符串类型 
+#define FAIL        -6 //失败 
+#define SCANEND     -7 //扫描完成 
+#define ERRORFOUND  -8 //异常错误 
 
 // \n 换行 
 // \t tab
@@ -16,13 +17,13 @@
 // \\ 反斜线 
 // \' 单引号 
 // \" 双引号 
-std::string ReserveWord[27]=
+std::string ReserveWord[26]=
 {
 	"for","foreach","forindex","while",
 	"var","func","break","continue","return",
 	"if","else","elsif","nil","and","or",
 	"print","cmp","append","setsize","subvec","pop",
-	"sort","contains","delete","keys","typeof","id"
+	"sort","contains","delete","keys","typeof"
 };
 
 std::string OperatorOrDelimiter[40]=
@@ -35,11 +36,11 @@ std::string OperatorOrDelimiter[40]=
 };
 
 std::string IdentifierTable[1000]={""};
-char ResourcePrograme[16384];
+char ResourcePrograme[16777216];
 
 int isReserveWord(std::string &p)
 {
-	for(int i=0;i<27;++i)
+	for(int i=0;i<26;++i)
 		if(ReserveWord[i]==p)
 			return i+1;
 	return FAIL;
@@ -55,12 +56,12 @@ int isOperatorOrDelimiter(std::string &p)
 
 bool isLetter(char t)
 {
-	return ('a'<=t && t<='z' || 'A'<=t && t<='Z');
+	return (('a'<=t) && (t<='z') || ('A'<=t) && (t<='Z'));
 }
 
 bool isNumber(char t)
 {
-	return ('0'<=t && t<='9');
+	return (('0'<=t) && (t<='9'));
 }
 
 void InputFile(std::string &FileName)
@@ -122,7 +123,7 @@ void Scanner(int &Syn,const char Source[],std::string &token,int &ptr)
 		}
 		Syn=isReserveWord(token);
 		if(Syn==FAIL)
-			Syn=SELFDEFINE;
+			Syn=IDENTIFIER;
 		else
 			Syn=RESERVEWORD;
 	}
@@ -145,17 +146,17 @@ void Scanner(int &Syn,const char Source[],std::string &token,int &ptr)
 		Syn=NUMBER;
 	}
 	else if(temp=='(' || temp==')' || temp=='[' || temp==']' || temp=='{' ||
-			temp=='}' || temp==',' || temp==';' || temp=='\"' || temp==':' ||
-			temp=='?' || temp=='.' || temp=='`' || temp=='\'' || temp=='&' ||
-			temp=='|')
+			temp=='}' || temp==',' || temp==';' || temp=='|' || temp==':' ||
+			temp=='?' || temp=='.' || temp=='`' || temp=='\'' || temp=='&'||
+			temp=='%' || temp=='$' || temp=='^')
 	{
 		token+=temp;
 		++ptr;
-		Syn=IDENTIFIER;
+		Syn=OPERATOR;
 	}
 	else if(temp=='=' || temp=='+' || temp=='-' || temp=='*' || temp=='!' || temp=='/' || temp=='<' || temp=='>' || temp=='~')
 	{
-		Syn=IDENTIFIER;
+		Syn=OPERATOR;
 		token+=temp;
 		++ptr;
 		temp=Source[ptr];
@@ -167,13 +168,7 @@ void Scanner(int &Syn,const char Source[],std::string &token,int &ptr)
 	}
 	else if(temp=='\\')
 	{
-		/*
-		"+","-","*","/","=","+=","-=","*=","/=",
-		"\n","\t","\r","\\","\'","\"",".",
-		"<","<=",">",">=","==","!=","!","~",
-		",",";","(",")","[","]","{","}","#"
-		*/
-		Syn=IDENTIFIER;
+		Syn=OPERATOR;
 		token+=temp;
 		++ptr;
 		temp=Source[ptr];
@@ -183,6 +178,43 @@ void Scanner(int &Syn,const char Source[],std::string &token,int &ptr)
 			++ptr;
 		}
 	}
+	else if(temp=='\"')
+	{
+		Syn=STRING;
+		token+=temp;
+		++ptr;
+		temp=Source[ptr];
+		while(temp!='\"')
+		{
+			if(temp=='\\')
+			{
+				token+=temp;
+				
+				++ptr;
+				temp=Source[ptr];
+				token+=temp;
+				
+				++ptr;
+				temp=Source[ptr];
+			}
+			else
+			{
+				token+=temp;
+				++ptr;
+				temp=Source[ptr];
+			}
+			if(temp=='@' || temp=='\n')
+				break;
+		}
+		//add the last char \"
+		if(temp=='\"')
+		{
+			token+=temp;
+			++ptr;
+		}
+		else
+			token+=" __missing_end_of_string";
+	}
 	else if(temp=='@')
 	{
 		Syn=SCANEND;
@@ -192,10 +224,10 @@ void Scanner(int &Syn,const char Source[],std::string &token,int &ptr)
 	{
 		Syn=FAIL;
 		std::cout<<"[Error] Unexpected error occurred: "<<temp<<std::endl;
+		system("pause");
 		++ptr;
 		return;
 	}
-	
 	if(token=="")
 	{
 		Syn=ERRORFOUND;
@@ -241,14 +273,16 @@ int main()
 		while(Syn!=SCANEND && Syn!=ERRORFOUND)
 		{
 			Scanner(Syn,ResourcePrograme,token,Ptr);
-			if(Syn==IDENTIFIER)
-				std::cout<<"( "<<token<<" , ---- )"<<std::endl;
-			else if(Syn==SELFDEFINE)
-				std::cout<<"( 标识符 , "<<token<<" )"<<std::endl;
+			if(Syn==OPERATOR)
+				std::cout<<"( Operator    | "<<token<<" )"<<std::endl;
+			else if(Syn==IDENTIFIER)
+				std::cout<<"( Identifier  | "<<token<<" )"<<std::endl;
 			else if(Syn==NUMBER)
-				std::cout<<"( Number , "<<token<<" )"<<std::endl;
+				std::cout<<"( Number      | "<<token<<" )"<<std::endl;
 			else if(Syn==RESERVEWORD)
-				std::cout<<"( Reserve Word , "<<token<<" )"<<std::endl;
+				std::cout<<"( ReserveWord | "<<token<<" )"<<std::endl;
+			else if(Syn==STRING)
+				std::cout<<"( String      | "<<token<<" )"<<std::endl;
 		}
 		std::cout<<">> Complete scanning \""<<FileNameOrCommand<<"\"."<<std::endl;
 		//fout.close();