diff --git a/src/parser/lexical_analyzer.l b/src/parser/lexical_analyzer.l
index e6c17282234856da5743a22d95b8b055860d133b..9cdeee8e11da3dfcbfd3e1192be29a0fc09d337f 100644
--- a/src/parser/lexical_analyzer.l
+++ b/src/parser/lexical_analyzer.l
@@ -7,6 +7,8 @@
 #include "syntax_tree.h"
 #include "syntax_analyzer.h"
 
+/* #define __DEBUG_COMMENT__ */
+
 int lines = 1;
 int pos_start;
 int pos_end;
@@ -16,27 +18,32 @@ void pass_node(char *text){
 }
 void comment_helper(char *comment, unsigned int len) 
 {
-    pos_end += 2;
-    for (int i = 2; i < len-2; i++){
-        if (comment[i] == '\n' || comment[i] == '\r'){
-            lines++;
-            pos_end = 0;
-        } else
-            pos_end++;
-    }
-    pos_end += 2;
+#ifdef __DEBUG_COMMENT__
+    printf("Get COMMENT in line<%d>: \"%s\"\n", lines, comment);
+#endif
+    /* pos_end += 2;
+     * for (int i = 2; i < len-2; i++){
+     *     if (comment[i] == '\n' || comment[i] == '\r'){
+     *         lines++;
+     *         pos_end = 0;
+     *     } else
+     *         pos_end++;
+     * }
+     * pos_end += 2; */
 }
 
 /*****************声明和选项设置  end*****************/
 
 %}
 
+/* use exclusive state */
+%x COMMENT
+
 letter [a-zA-Z]
 digit [0-9]
 ID {letter}+
 INTEGER {digit}+
 FLOAT {digit}+\.|{digit}*\.{digit}+
-COMMENT "/*".*"*/"
 
 NEWLINE \r\n|\r|\n
 WHITESPACE [ \t]
@@ -48,9 +55,14 @@ WHITESPACE [ \t]
 %token <node> _SEMI _COMMA _ID _INTEGER _FLOATPOINT
 
 */
+/* <COMMENT>.* { pos_end += yyleng; comment_helper(yytext, yyleng); } */
 
 %%
-{COMMENT} { comment_helper(yytext, yyleng); }
+
+<INITIAL>"/*" { BEGIN(COMMENT); pos_end += 2; }
+<COMMENT>[^*\n]*|"*"+[^*/\n]* { pos_end += yyleng; comment_helper(yytext, yyleng); }
+<COMMENT>"*/" { BEGIN(0); pos_end += 2; }
+
 if { pos_start = pos_end; pos_end += 2; pass_node("if"); return _IF;}
 else { pos_start = pos_end; pos_end += 4; pass_node("else"); return _ELSE;}
 while { pos_start = pos_end; pos_end += 5; pass_node("while"); return _WHILE;}
@@ -75,5 +87,5 @@ void { pos_start = pos_end; pos_end += 4; pass_node("void"); return _VOID;}
 ","|";" { pos_start = pos_end; pos_end += 1; pass_node(yytext); return yytext[0] == ',' ? _COMMA : _SEMI;}
 
 {WHITESPACE} { pos_end++; }
-{NEWLINE} { lines++; pos_end = 0;}
+<*>{NEWLINE} { lines++; pos_end = 0;}
 %%
diff --git a/src/parser/syntax_analyzer.y b/src/parser/syntax_analyzer.y
index 1ae75be07e208e895ba7f2b3378e78c4158c9078..9842706f81a42d4cab30000e74e059b163ca32f8 100644
--- a/src/parser/syntax_analyzer.y
+++ b/src/parser/syntax_analyzer.y
@@ -82,7 +82,7 @@ DEC: VAR_DEC {$$ = node("declaration", 1, $1); }
    ;
 
 VAR_DEC: TYPE_SPEC _ID _SEMI {$$ = node("var-declaration", 3, $1, $2, $3); }
-       | TYPE_SPEC _ID _L_BRACKET _INTEGER _R_BRACKET _SEMI {$$ = node("var-declaration", 6, $1, $2, $3, $4, $5, $6); }
+       | TYPE_SPEC _ID _L_SQUARE _INTEGER _R_SQUARE _SEMI {$$ = node("var-declaration", 6, $1, $2, $3, $4, $5, $6); }
        ;
 
 TYPE_SPEC: _INT {$$ = node("type-specifier", 1, $1); }
diff --git a/tests/parser/syntree_simple/*.syntax_tree b/tests/parser/syntree_simple/*.syntax_tree
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391