diff --git a/src/lexer/lexical_analyzer.l b/src/lexer/lexical_analyzer.l
index c6ac08f728c7761f6eefa27fba03fbb4a84a5cc4..242f211695de547ed8c25f76a9e2d0520ec498c3 100755
--- a/src/lexer/lexical_analyzer.l
+++ b/src/lexer/lexical_analyzer.l
@@ -20,12 +20,51 @@ int pos_end;
  /******************TODO*********************/
  /****请在此补全所有flex的模式与动作  start******/
  //STUDENT TO DO
-
+ /******** 运算 ********/
+\+ {pos_start=pos_end;pos_end+=strlen(yytext);return ADD;}
+\- {pos_start=pos_end;pos_end+=strlen(yytext);return SUB;}
+\* {pos_start=pos_end;pos_end+=strlen(yytext);return MUL;}
+\/ {pos_start=pos_end;pos_end+=strlen(yytext);return DIV;}
+\< {pos_start=pos_end;pos_end+=strlen(yytext);return LT;}
+\<\= {pos_start=pos_end;pos_end+=strlen(yytext);return LTE;}
+\> {pos_start=pos_end;pos_end+=strlen(yytext);return GT;}
+\>\= {pos_start=pos_end;pos_end+=strlen(yytext);return GTE;}
+\=\= {pos_start=pos_end;pos_end+=strlen(yytext);return EQ;}
+\!\= {pos_start=pos_end;pos_end+=strlen(yytext);return NEQ;}
+\= {pos_start=pos_end;pos_end+=strlen(yytext);return ASSIN;}
+
+ /******** 符号 ********/
+\; {pos_start=pos_end;pos_end+=strlen(yytext);return SEMICOLON;}
+\, {pos_start=pos_end;pos_end+=strlen(yytext);return COMMA;}
+\( {pos_start=pos_end;pos_end+=strlen(yytext);return LPARENTHESE;}
+\) {pos_start=pos_end;pos_end+=strlen(yytext);return RPARENTHESE;}
+\[ {pos_start=pos_end;pos_end+=strlen(yytext);return LBRACKET;}
+\] {pos_start=pos_end;pos_end+=strlen(yytext);return RBRACKET;}
+\{ {pos_start=pos_end;pos_end+=strlen(yytext);return LBRACE;}
+\} {pos_start=pos_end;pos_end+=strlen(yytext);return RBRACE;}
+
+ /******** 关键字 ********/
+else {pos_start=pos_end;pos_end+=strlen(yytext);return ELSE;}
+if {pos_start=pos_end;pos_end+=strlen(yytext);return IF;}
+int {pos_start=pos_end;pos_end+=strlen(yytext);return INT;}
+float {pos_start=pos_end;pos_end+=strlen(yytext);return FLOAT;}
+return {pos_start=pos_end;pos_end+=strlen(yytext);return RETURN;}
+void {pos_start=pos_end;pos_end+=strlen(yytext);return VOID;}
+while {pos_start=pos_end;pos_end+=strlen(yytext);return WHILE;}
+
+ /******** ID和NUM ********/
+[a-zA-Z]+ {pos_start=pos_end;pos_end+=strlen(yytext);return IDENTIFIER;}
+[0-9]+ {pos_start=pos_end;pos_end+=strlen(yytext);return INTEGER;}
+[0-9]+\.[0-9]+ {pos_start=pos_end;pos_end+=strlen(yytext);return FLOATPOINT;}
+[0-9]+\. {pos_start=pos_end;pos_end+=strlen(yytext);return FLOATPOINT;}
+\[\] {pos_start=pos_end;pos_end+=strlen(yytext);return ARRAY;}
+[a-zA-Z] {pos_start=pos_end;pos_end+=strlen(yytext);return LETTER;}
+
+ /******** others ********/
+[\n]+ {pos_start = 1;pos_end = 1;lines+=strlen(yytext);return EOL;}
+\/\*([^\*]|(\*)*[^\*\/])*(\*)*\*\/ {return COMMENT;}
+[ \f\n\r\t\v] {pos_start = pos_end;pos_end+=strlen(yytext);return BLANK;}
 . {return ERROR;}
-
-
-
-
  /****请在此补全所有flex的模式与动作  end******/
 %%
 /****************C代码 start*************/
@@ -52,6 +91,15 @@ void analyzer(char* input_file, Token_Node* token_stream){
         switch(token){
             case COMMENT:
                 //STUDENT TO DO
+	    for(int i = 0;i < strlen(yytext);i++)
+	    {
+		pos_end++;
+                if( yytext[i] == '\n' )
+                {
+			lines += 1;pos_end = 1;
+                }
+            }
+            break;
             case BLANK:
                 //STUDENT TO DO
                 break;
@@ -80,7 +128,3 @@ void analyzer(char* input_file, Token_Node* token_stream){
     printf("[END]: Analysis completed.\n");
     return;
 }
-
-
-
-/****************C代码 end*************/