diff --git a/src/antlr4/SysY.g4 b/src/antlr4/SysY.g4
index 263aeef..cc41169 100644
--- a/src/antlr4/SysY.g4
+++ b/src/antlr4/SysY.g4
@@ -1,8 +1,4 @@
-// SysY 子集语法：支持形如
-// int main() { int a = 1; int b = 2; return a + b; }
-// 的最小返回表达式编译。
-
-// 后续需要自行添加
+// SysY 语法：支持完整的 SysY 子集
 
 grammar SysY;
 
@@ -11,19 +7,45 @@ grammar SysY;
 /*===-------------------------------------------===*/
 
 INT: 'int';
+VOID: 'void';
+FLOAT: 'float';
 RETURN: 'return';
+CONST: 'const';
+IF: 'if';
+ELSE: 'else';
+WHILE: 'while';
+BREAK: 'break';
 
 ASSIGN: '=';
 ADD: '+';
+SUB: '-';
+MUL: '*';
+DIV: '/';
+MOD: '%';
+
+LT: '<';
+LE: '<=';
+GT: '>';
+GE: '>=';
+EQ: '==';
+NEQ: '!=';
+
+AND: '&&';
+OR: '||';
+NOT: '!';
 
 LPAREN: '(';
 RPAREN: ')';
 LBRACE: '{';
 RBRACE: '}';
+LBRACK: '[';
+RBRACK: ']';
 SEMICOLON: ';';
+COMMA: ',';
 
 ID: [a-zA-Z_][a-zA-Z_0-9]*;
 ILITERAL: [0-9]+;
+FLITERAL: [0-9]+('.'[0-9]+)?([eE][+-]?[0-9]+)?;
 
 WS: [ \t\r\n] -> skip;
 LINECOMMENT: '//' ~[\r\n]* -> skip;
@@ -34,15 +56,29 @@ BLOCKCOMMENT: '/*' .*? '*/' -> skip;
 /*===-------------------------------------------===*/
 
 compUnit
-    : funcDef EOF
+    : (decl | funcDef)* EOF
     ;
 
 decl
-    : btype varDef SEMICOLON
+    : constDecl
+    | varDecl
+    ;
+
+constDecl
+    : CONST btype constDef (COMMA constDef)* SEMICOLON
+    ;
+
+constDef
+    : lValue ASSIGN initValue
+    ;
+
+varDecl
+    : btype varDef (COMMA varDef)* SEMICOLON
     ;
 
 btype
     : INT
+    | FLOAT
     ;
 
 varDef
@@ -51,14 +87,29 @@ varDef
 
 initValue
     : exp
+    | arrayInit
+    ;
+
+arrayInit
+    : LBRACE (initValue (COMMA initValue)*)? RBRACE
     ;
 
 funcDef
-    : funcType ID LPAREN RPAREN blockStmt
+    : funcType ID LPAREN (funcFParams)? RPAREN blockStmt
     ;
 
 funcType
     : INT
+    | VOID
+    | FLOAT
+    ;
+
+funcFParams
+    : funcFParam (COMMA funcFParam)*
+    ;
+
+funcFParam
+    : btype ID (LBRACK (exp)? RBRACK)*
     ;
 
 blockStmt
@@ -72,27 +123,78 @@ blockItem
 
 stmt
     : returnStmt
+    | assignStmt
+    | ifStmt
+    | whileStmt
+    | breakStmt
+    | continueStmt
+    | exprStmt
+    | blockStmt
+    ;
+
+continueStmt
+    : 'continue' SEMICOLON
     ;
 
 returnStmt
-    : RETURN exp SEMICOLON
+    : RETURN (exp)? SEMICOLON
+    ;
+
+assignStmt
+    : lValue ASSIGN exp SEMICOLON
+    ;
+
+ifStmt
+    : IF LPAREN cond RPAREN stmt (ELSE stmt)?
+    ;
+
+whileStmt
+    : WHILE LPAREN cond RPAREN stmt
+    ;
+
+breakStmt
+    : BREAK SEMICOLON
+    ;
+
+exprStmt
+    : exp SEMICOLON
+    ;
+
+cond
+    : exp
     ;
 
 exp
     : LPAREN exp RPAREN          # parenExp
     | var                        # varExp
     | number                     # numberExp
+    | ID LPAREN (exp (COMMA exp)*)? RPAREN # funcCallExp
+    | SUB exp                    # unaryMinusExp
+    | NOT exp                    # unaryNotExp
+    | exp MUL exp                # multiplicativeExp
+    | exp DIV exp                # multiplicativeExp
+    | exp MOD exp                # multiplicativeExp
     | exp ADD exp                # additiveExp
+    | exp SUB exp                # additiveExp
+    | exp LT exp                 # relationalExp
+    | exp LE exp                 # relationalExp
+    | exp GT exp                 # relationalExp
+    | exp GE exp                 # relationalExp
+    | exp EQ exp                 # equalityExp
+    | exp NEQ exp                # equalityExp
+    | exp AND exp                # logicalAndExp
+    | exp OR exp                 # logicalOrExp
     ;
 
 var
-    : ID
+    : ID (LBRACK exp RBRACK)*
     ;
 
 lValue
-    : ID
+    : ID (LBRACK exp RBRACK)*
     ;
 
 number
     : ILITERAL
+    | FLITERAL
     ;
diff --git a/test_all.sh b/test_all.sh
new file mode 100755
index 0000000..ea338b6
--- /dev/null
+++ b/test_all.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# 测试所有 .sy 文件的解析
+# 确定脚本所在目录
+SCRIPT_DIR="$(dirname "$(realpath "$0")")"
+TEST_DIR="$SCRIPT_DIR/nudt-compiler-cpp/test/test_case"
+COMPILER="$SCRIPT_DIR/nudt-compiler-cpp/build/bin/compiler"
+
+# 遍历所有 .sy 文件
+find "$TEST_DIR" -name "*.sy" | sort | while read -r file; do
+    echo "Testing $file..."
+    "$COMPILER" --emit-parse-tree "$file"
+    if [ $? -eq 0 ]; then
+        echo "✓ $file: SUCCESS"
+    else
+        echo "✗ $file: FAILED"
+    fi
+    echo ""
+done