diff --git a/pages.json b/pages.json
index d2c14511549dccdb821c5e510d327b545b893adb..b5379b083e7726453e885a8701470d2b53d0753a 100644
--- a/pages.json
+++ b/pages.json
@@ -164,10 +164,17 @@
 				"enablePullDownRefresh": false
 			}
 
-		}
+		},
+    {
+    	"path": "pages/SyntaxCase/defaultValueTest",
+    	"style": {
+    		"navigationBarTitleText": "",
+    		"enablePullDownRefresh": false
+    	}
+    },
+    
     // #endif
     // #ifdef APP
-    ,
 		{
 			"path": "pages/SyntaxCase/utsAndroid",
 			"style": {
diff --git a/pages/SyntaxCase/defaultValueTest.vue b/pages/SyntaxCase/defaultValueTest.vue
new file mode 100644
index 0000000000000000000000000000000000000000..d4f63a6d8f94b06c4ad4fb6b86a3d3ebba6fd64c
--- /dev/null
+++ b/pages/SyntaxCase/defaultValueTest.vue
@@ -0,0 +1,65 @@
+<template>
+	<view class="buttons">
+		<button @click="testClick">测试全部</button>
+		<text>{{testRet}}</text>
+	</view>
+</template>
+
+<script setup>
+	import { 
+        Scan, 
+        Scan1, 
+        Scan2, 
+        myClass
+  } from "@/uni_modules/uts-syntaxcase";
+	import { ref } from 'vue'
+	
+	const myClassInit = new myClass();
+	let testRet = ref("1");
+	const testClick = function(){
+		testRet.value = "success"
+    // #ifdef APP-ANDROID
+      if(Scan() != 60000){
+      	testRet = "error1"
+      	console.log("error1")
+      }
+      if(Scan(100) != 100){
+      	testRet = "error2"
+      	console.log("error2")
+      }
+    // #endif
+		
+		if(Scan1() != "null"){
+			testRet = "error3"
+			console.log("error3")
+		}
+		if(Scan1(100) != 100){
+			testRet = "error4"
+			console.log("error4")
+		}
+		if(Scan2() != "null"){
+			testRet = "error5"
+			console.log("error5")
+		}
+		if(Scan2(100) != 100){
+			testRet = "error6"
+			console.log("error6")
+		}
+		if(myClassInit.to('123') != "123"){
+			testRet = "error7"
+			console.log("error7")
+		}
+		
+	}
+</script>
+
+<style lang="scss">
+	.buttons{
+		padding: 20rpx 20rpx 460rpx;
+		button{
+			margin-bottom: 20rpx;
+			font-size: 28rpx;
+			padding: 3px;
+		}
+	}
+</style>
diff --git a/pages/SyntaxCase/instanceTest.vue b/pages/SyntaxCase/instanceTest.vue
index 07c115e61bde222122ace9e97cbec9c1876d83e2..7997790e9f03eae66aa2744ec8715fdb2e8a75c9 100644
--- a/pages/SyntaxCase/instanceTest.vue
+++ b/pages/SyntaxCase/instanceTest.vue
@@ -2,6 +2,7 @@
   <div>
     {{ret}}
     <button @click="instanceCreate">多实例创建测试</button>
+    <button @click="defaultValueTest">默认值测试</button>
   </div>
 	
 </template>
@@ -11,7 +12,12 @@
 		User
 	} from '@/uni_modules/uts-advance'
 
-
+  import {
+      Scan, 
+      Scan1, 
+      Scan2, 
+      myClass
+  } from "@/uni_modules/uts-syntaxcase";
 
 	export default {
 		data() {
@@ -21,6 +27,34 @@
 		},
 		methods: {
 			
+      defaultValueTest() {
+        const myClassInit = new myClass();
+        // 默认值测试
+        if(Scan() != 60000){
+          this.ret = "测试失败1"
+        }
+        if(Scan(100) != 100){
+          this.ret = "测试失败2"
+        }
+        if(Scan1() != null){
+          this.ret = "测试失败3"
+        }
+        if(Scan1(100) != 100){
+          this.ret = "测试失败4"
+        }
+        let ret5 = Scan2()
+        if(ret5 != "null"){
+          console.log(ret5)
+          this.ret = "测试失败5"
+        }
+        if(Scan2(100) != 100){
+          this.ret = "测试失败6"
+        }
+        if(myClassInit.to('123') != 123){
+          this.ret = "测试失败7"
+        }
+      },
+      
 			instanceCreate() {
 				
 				const user1 = new User("张三", 20);
diff --git a/pages/advance/advance.vue b/pages/advance/advance.vue
index 6298bf36aaa7f43689de7ccf97e01cd79fc09346..fc34fe2ddac4d0fb39d195424a153049199501fb 100644
--- a/pages/advance/advance.vue
+++ b/pages/advance/advance.vue
@@ -116,10 +116,17 @@
                         }, {
                             name: "参数传递示例",
                             url: "SyntaxCase/paramTest"
-                        },{
+                        },
+                        {
                             name: "实例测试示例",
                             url: "SyntaxCase/instanceTest"
                         },
+                        // #ifdef UNI-APP-X
+                        {
+                            name: "默认值测试示例",
+                            url: "SyntaxCase/defaultValueTest"
+                        },
+                        // #endif
                         {
                             name: "混编测试示例",
                             url: "SyntaxCase/MixNativeCode"
diff --git a/uni_modules/uts-syntaxcase/utssdk/index.uts b/uni_modules/uts-syntaxcase/utssdk/index.uts
index b9bc6bf0ce8209866c9d9705f915b7b8953e2d67..113a951e7a60773d7ed6db588d68ba01ba4e87d8 100644
--- a/uni_modules/uts-syntaxcase/utssdk/index.uts
+++ b/uni_modules/uts-syntaxcase/utssdk/index.uts
@@ -428,4 +428,44 @@ export class UTSActivityComponentCallback extends UniActivityComponentCallback {
   }
 }
 // #endif
-// #endif
\ No newline at end of file
+// #endif
+
+export function Scan(timeMillis : Number = 60000):number {
+	console.log("Scan", timeMillis)
+	return timeMillis
+}
+
+export function Scan1(timeMillis ?: Number):string {
+	console.log("Scan", timeMillis)
+	if(timeMillis == null){
+		return "null"
+	}
+	return timeMillis.toString()
+}
+
+export function Scan2(timeMillis ?: Number | null):string {
+	console.log("Scan", timeMillis)
+	if(timeMillis == null){
+		return "null"
+	}
+	return timeMillis.toString()
+}
+
+export class myClass {
+	constructor() {
+		
+	}
+	
+	to(name: String):string {
+		console.log(name);
+		return name
+	}
+	
+	to1(name?: String):string {
+		if(name == null){
+			return "null"
+		}
+		console.log(name);
+		return name!
+	}
+}
\ No newline at end of file