diff --git a/uni_modules/uts-tests/utssdk/JSON.uts b/uni_modules/uts-tests/utssdk/JSON.uts
index 32cb2da5f60131a06e900791d03319dde9d05342..cdf8917b776c4c876812c70af40fb12e0315056b 100644
--- a/uni_modules/uts-tests/utssdk/JSON.uts
+++ b/uni_modules/uts-tests/utssdk/JSON.uts
@@ -38,9 +38,59 @@ function countOccurrences(str : string, substr : string) : number {
   return count;
 }
 
+class A1 implements IJsonStringify{
+  override toJSON():any|null{
+  	let jsonRet = {
+  		'name': "zhangsan",
+  		'age': 12,
+  	}
+  	return jsonRet
+  }
+}
+
+class A2 implements IJsonStringify{
+  override toJSON():any|null{
+  	return 2
+  }
+}
+
+class A3 implements IJsonStringify{
+  override toJSON():any|null{
+  	return "json"
+  }
+}
+
+class A4 implements IJsonStringify{
+  override toJSON():any|null{
+  	return null
+  }
+}
+
+class A5 implements IJsonStringify{
+  override toJSON():any|null{
+  	return new A1()
+  }
+}
+
+class A6 implements IJsonStringify{
+  override toJSON():any|null{
+  	return new A5()
+  }
+}
+
 
 export function testJSON() : Result {
   return describe("JSON", () => {
+    
+    test('custom-stringify', () => {
+      expect(JSON.stringify(new A1()).length).toEqual(28)
+      expect(JSON.stringify(new A2())).toEqual("2")
+      expect(JSON.stringify(new A3())).toEqual('"json"')
+      expect(JSON.stringify(new A4())).toEqual('null')
+      expect(JSON.stringify(new A5()).length).toEqual(28)
+      expect(JSON.stringify(new A6()).length).toEqual(28)
+    })
+    
     test('parse', () => {
       // #TEST JSON.parse_tip,JSON.parse
       const json = `{"result":true, "count":42}`;
@@ -264,9 +314,11 @@ export function testJSON() : Result {
       expect(a8.length).toEqual(73);
       expect(countOccurrences(a8, "99999")).toEqual(6);
 
-
       // #endif
     })
+    
+    
+    
     test('stringify', () => {
       // #ifdef APP-ANDROID
 
diff --git a/uni_modules/uts-tests/utssdk/tests.uts b/uni_modules/uts-tests/utssdk/tests.uts
index 27b1136983c3cdf2244c731128b2d7e98b0e48f3..fc6457d257277426d85eb7a4877caa0e74080492 100644
--- a/uni_modules/uts-tests/utssdk/tests.uts
+++ b/uni_modules/uts-tests/utssdk/tests.uts
@@ -2,7 +2,7 @@ import { Matchers,NumberMatchers } from './Matchers.uts'
 
 export const describes = new Map<string, Result>()
 
-export class Result implements io.dcloud.uts.json.IJsonStringify {
+export class Result implements IJsonStringify {
     total = 0
     passed: string[] = []
     failed: string[] = []