diff --git a/src/type-gen.test.ts b/src/type-gen.test.ts
index e36c6e3..48c6373 100644
--- a/src/type-gen.test.ts
+++ b/src/type-gen.test.ts
@@ -26,6 +26,15 @@ describe('Type generation for string literals and unions', () => {
       expect(schema.schema.type).toBe('stringLiteral');
       expect(schema.parse('"hello-world"')).toBe('hello-world');
     });
+
+    it('should parse string literal without quotes', () => {
+      const schema = defineSchema('"on"');
+      expect(schema.schema.type).toBe('stringLiteral');
+      // 不带引号的值应该像普通字符串一样解析
+      expect(schema.parse('on')).toBe('on');
+      expect(schema.validator('on')).toBe(true);
+      expect(schema.validator('off')).toBe(false);
+    });
   });
 
   describe('Union schema', () => {
@@ -42,10 +51,12 @@ describe('Type generation for string literals and unions', () => {
     it('should generate correct type for union of string literals', () => {
       const schema = defineSchema('"on" | "off"');
       expect(schema.schema.type).toBe('union');
-      
-      // Both values should be valid
+
+      // 带引号和不带引号的值都应该有效
       expect(schema.parse('"on"')).toBe('on');
       expect(schema.parse('"off"')).toBe('off');
+      expect(schema.parse('on')).toBe('on');
+      expect(schema.parse('off')).toBe('off');
       expect(schema.validator('on')).toBe(true);
       expect(schema.validator('off')).toBe(true);
       expect(schema.validator('maybe')).toBe(false);
@@ -70,19 +81,29 @@ describe('Type generation for string literals and unions', () => {
     it('should handle tuple with union field', () => {
       const schema = defineSchema('[name: string; status: "active" | "inactive"]');
       expect(schema.schema.type).toBe('tuple');
-      
-      const value = schema.parse('[john; "active"]');
-      expect(value).toEqual(['john', 'active']);
+
+      // 带引号和不带引号的值都应该有效
+      const value1 = schema.parse('[john; "active"]');
+      expect(value1).toEqual(['john', 'active']);
       expect(schema.validator(['john', 'active'])).toBe(true);
+      
+      const value2 = schema.parse('[john; active]');
+      expect(value2).toEqual(['john', 'active']);
+      
       expect(schema.validator(['john', 'unknown'])).toBe(false);
     });
 
     it('should handle array of unions', () => {
       const schema = defineSchema('("pending" | "approved" | "rejected")[]');
       expect(schema.schema.type).toBe('array');
+
+      // 带引号和不带引号的值都应该有效
+      const value1 = schema.parse('["pending"; "approved"]');
+      expect(value1).toEqual(['pending', 'approved']);
+      
+      const value2 = schema.parse('[pending; approved]');
+      expect(value2).toEqual(['pending', 'approved']);
       
-      const value = schema.parse('["pending"; "approved"]');
-      expect(value).toEqual(['pending', 'approved']);
       expect(schema.validator(['pending', 'approved'])).toBe(true);
       expect(schema.validator(['pending', 'unknown'])).toBe(false);
     });
@@ -90,9 +111,14 @@ describe('Type generation for string literals and unions', () => {
     it('should handle array of string literals', () => {
       const schema = defineSchema('"item"[]');
       expect(schema.schema.type).toBe('array');
+
+      // 带引号和不带引号的值都应该有效
+      const value1 = schema.parse('["item"; "item"; "item"]');
+      expect(value1).toEqual(['item', 'item', 'item']);
+      
+      const value2 = schema.parse('[item; item; item]');
+      expect(value2).toEqual(['item', 'item', 'item']);
       
-      const value = schema.parse('["item"; "item"; "item"]');
-      expect(value).toEqual(['item', 'item', 'item']);
       expect(schema.validator(['item', 'item'])).toBe(true);
       expect(schema.validator(['item', 'other'])).toBe(false);
     });
diff --git a/src/validator.ts b/src/validator.ts
index 3d6023e..0679bd1 100644
--- a/src/validator.ts
+++ b/src/validator.ts
@@ -126,40 +126,62 @@ class ValueParser {
 
   private parseStringLiteralValue(schema: StringLiteralSchema): string {
     const quote = this.peek();
-    if (quote !== '"' && quote !== "'") {
-      throw new ParseError(`Expected string literal with quotes for value "${schema.value}"`, this.pos);
-    }
-    this.consume(); // Consume opening quote
     
-    let value = '';
-    while (this.pos < this.input.length) {
-      const char = this.peek();
-      
-      if (char === '\\') {
-        this.consume();
-        const nextChar = this.consume();
-        if (nextChar === '"' || nextChar === "'" || nextChar === '\\' || nextChar === ';') {
-          value += nextChar;
+    // 支持带引号或不带引号的字符串值
+    if (quote === '"' || quote === "'") {
+      this.consume(); // Consume opening quote
+
+      let value = '';
+      while (this.pos < this.input.length) {
+        const char = this.peek();
+
+        if (char === '\\') {
+          this.consume();
+          const nextChar = this.consume();
+          if (nextChar === '"' || nextChar === "'" || nextChar === '\\' || nextChar === ';') {
+            value += nextChar;
+          } else {
+            value += '\\' + nextChar;
+          }
+        } else if (char === quote) {
+          this.consume(); // Consume closing quote
+
+          if (value !== schema.value) {
+            throw new ParseError(
+              `Invalid value '"${value}"'. Expected '"${schema.value}"'`,
+              this.pos
+            );
+          }
+
+          return value;
         } else {
-          value += '\\' + nextChar;
+          value += this.consume();
         }
-      } else if (char === quote) {
-        this.consume(); // Consume closing quote
-        
-        if (value !== schema.value) {
-          throw new ParseError(
-            `Invalid value '"${value}"'. Expected '"${schema.value}"'`,
-            this.pos
-          );
+      }
+
+      throw new ParseError('Unterminated string literal', this.pos);
+    } else {
+      // 不带引号的字符串，像普通字符串一样解析
+      let value = '';
+      while (this.pos < this.input.length) {
+        const char = this.peek();
+        if (char === ';' || char === ']' || char === ')') {
+          break;
         }
-        
-        return value;
-      } else {
         value += this.consume();
       }
+      
+      value = value.trim();
+      
+      if (value !== schema.value) {
+        throw new ParseError(
+          `Invalid value '${value}'. Expected '${schema.value}'`,
+          this.pos - value.length
+        );
+      }
+
+      return value;
     }
-    
-    throw new ParseError('Unterminated string literal', this.pos);
   }
 
   private parseUnionValue(schema: UnionSchema): unknown {