diff --git a/src/lexer/lexical_analyzer.l b/src/lexer/lexical_analyzer.l
index ef3ce7e8483f3b578d7d57e36d35f16c5bc45f76..0bf6ff868ac30485d195a17221ffe05b83b0b274 100644
--- a/src/lexer/lexical_analyzer.l
+++ b/src/lexer/lexical_analyzer.l
@@ -20,7 +20,50 @@ 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++; return ADD;}
+\-   {pos_start = pos_end; pos_end++; return SUB;}
+\*   {pos_start = pos_end; pos_end++; return MUL;}
+\/   {pos_start = pos_end; pos_end++; return DIV;}
+\<   {pos_start = pos_end; pos_end++; return LT;}
+"<=" {pos_start = pos_end; pos_end+=2; return LTE;}
+\>   {pos_start = pos_end; pos_end++; return GT;}
+">=" {pos_start = pos_end; pos_end+=2; return GTE;}
+"==" {pos_start = pos_end; pos_end+=2; return EQ;}
+"!=" {pos_start = pos_end; pos_end+=2; return NEQ;}
+\=   {pos_start = pos_end; pos_end++; return ASSIN;}
+
+ /* 符号 */
+\;   {pos_start = pos_end; pos_end++; return SEMICOLON;}
+\,   {pos_start = pos_end; pos_end++; return COMMA;}
+\(  {pos_start = pos_end; pos_end++; return LPARENTHESE;}
+\)  {pos_start = pos_end; pos_end++; return RPARENTHESE;}
+\[  {pos_start = pos_end; pos_end++; return LBRACKET;}
+\]  {pos_start = pos_end; pos_end++; return RBRACKET;}
+\{  {pos_start = pos_end; pos_end++; return LBRACE;}
+\}  {pos_start = pos_end; pos_end++; return RBRACE;}
+
+ /* 关键字 */
+else {pos_start = pos_end; pos_end+=4; return ELSE;}
+if   {pos_start = pos_end; pos_end+=2; return IF;}
+int  {pos_start = pos_end; pos_end+=3; return INT;}
+float {pos_start = pos_end; pos_end+=5; return FLOAT;}
+return {pos_start = pos_end; pos_end+=6; return RETURN;}
+void   {pos_start = pos_end; pos_end+=4; return VOID;}
+while  {pos_start = pos_end; pos_end+=5; return WHILE;}
+
+ /* ID & NUM */
+[a-zA-Z]+ {pos_start = pos_end; pos_end+=yyleng; return IDENTIFIER;}
+[0-9]+    {pos_start = pos_end; pos_end+=yyleng; return INTEGER;}
+[0-9]+\.|[0-9]*\.[0-9]+ {pos_start = pos_end; pos_end+=yyleng; return FLOATPOINT;}
+"[]" {pos_start = pos_end; pos_end+=2; return ARRAY;}
+[a-zA-Z]  {pos_start = pos_end; pos_end++; return LETTER;}
+
+ /* others */
+\n  {return EOL;}
+\/\*[^*]*\*+([^/*][^*]*\*+)*\/  {return COMMENT;}
+" " {pos_start = pos_end; pos_end+=yyleng; return BLANK;}
+\t  {pos_start = pos_end; pos_end+=yyleng; return BLANK;}
 . {return ERROR;}
 
 
@@ -52,11 +95,21 @@ void analyzer(char* input_file, Token_Node* token_stream){
         switch(token){
             case COMMENT:
                 //STUDENT TO DO
+                   for (int i=0;i<yyleng;i++){
+                    if (yytext[i]=='\n'){   /*换行操作*/
+                        lines++;
+                        pos_end=1;
+                    }
+                    else pos_end++;
+                }
+                break;
             case BLANK:
                 //STUDENT TO DO
                 break;
             case EOL:
                 //STUDENT TO DO
+                lines++;
+                pos_end=1;
                 break;
             case ERROR:
                 printf("[ERR]: unable to analysize %s at %d line, from %d to %d\n", yytext, lines, pos_start, pos_end);
@@ -83,4 +136,4 @@ void analyzer(char* input_file, Token_Node* token_stream){
 
 
 
-/****************C代码 end*************/
+/****************C代码 end*************/
\ No newline at end of file