diff --git a/ETSUI/StringCodec/README.md b/ETSUI/StringCodec/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..3d951cae2ebb92ce2381677eb29e239799ea0a9c
--- /dev/null
+++ b/ETSUI/StringCodec/README.md
@@ -0,0 +1,19 @@
+# 字符串编解码
+
+### 简介
+
+本示例对字符串进行了特定格式的输出，对错误码的内容进行了文本输出，对字符串的编码和解码做了演示结果。
+
+### 使用说明
+
+1：点击特定格式输出，文本框会对该字符串进行不同格式的结果输出，例如整数、浮点数、字符串等格式。
+
+2：点击获取系统对应的详细信息按钮，每行文本框输出左边的错误码所表示的具体文本意思。
+
+3：点击文本编辑器，会对上面字符串编码后输出对应文本，并输出数据读取与写入的相关信息。
+
+4：点击文本译码器，会对上面编码的文本内容进行译码，输出结果为上述编码前的字符串。
+
+### 约束与限制
+
+本示例仅支持在标准设备上运行。
\ No newline at end of file
diff --git a/ETSUI/StringCodec/build.gradle b/ETSUI/StringCodec/build.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..c2c8bbaed13747b913f19cef893f515bc32d02a7
--- /dev/null
+++ b/ETSUI/StringCodec/build.gradle
@@ -0,0 +1,34 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+apply plugin: 'com.huawei.ohos.app'
+
+//For instructions on signature configuration, see https://developer.harmonyos.com/cn/docs/documentation/doc-guides/ide_debug_device-0000001053822404#section1112183053510
+ohos {
+    compileSdkVersion 7
+    supportSystem "standard"
+}
+
+buildscript {
+    repositories {
+        maven {
+            url 'https://repo.huaweicloud.com/repository/maven/'
+        }
+        maven {
+            url 'https://developer.huawei.com/repo/'
+        }
+    }
+    dependencies {
+        classpath 'com.huawei.ohos:hap:3.0.3.4'
+        classpath 'com.huawei.ohos:decctest:1.2.6.0'
+    }
+}
+
+allprojects {
+    repositories {
+        maven {
+            url 'https://repo.huaweicloud.com/repository/maven/'
+        }
+        maven {
+            url 'https://developer.huawei.com/repo/'
+        }
+    }
+}
diff --git a/ETSUI/StringCodec/entry/build.gradle b/ETSUI/StringCodec/entry/build.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..1587dd1948941f3eaaf092ae6cae7969cb6895ff
--- /dev/null
+++ b/ETSUI/StringCodec/entry/build.gradle
@@ -0,0 +1,21 @@
+apply plugin: 'com.huawei.ohos.hap'
+//For instructions on signature configuration, see https://developer.harmonyos.com/cn/docs/documentation/doc-guides/ide_debug_device-0000001053822404#section1112183053510
+ohos {
+    compileSdkVersion 7
+    defaultConfig {
+        compatibleSdkVersion 7
+    }
+    buildTypes {
+        release {
+            proguardOpt {
+                proguardEnabled false
+                rulesFiles 'proguard-rules.pro'
+            }
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar', '*.har'])
+    testImplementation 'junit:junit:4.13.1'
+}
diff --git a/ETSUI/StringCodec/entry/src/main/config.json b/ETSUI/StringCodec/entry/src/main/config.json
new file mode 100644
index 0000000000000000000000000000000000000000..27a3d3a6ed5d95ec767010b93945edbb9e17e65a
--- /dev/null
+++ b/ETSUI/StringCodec/entry/src/main/config.json
@@ -0,0 +1,66 @@
+{
+  "app": {
+    "bundleName": "ohos.samples.stringcodec",
+    "vendor": "samples",
+    "version": {
+      "code": 1000000,
+      "name": "1.0.0"
+    }
+  },
+  "deviceConfig": {},
+  "module": {
+    "package": "ohos.samples.stringcodec",
+    "name": ".MyApplication",
+    "mainAbility": ".MainAbility",
+    "deviceType": [
+      "phone"
+    ],
+    "distro": {
+      "deliveryWithInstall": true,
+      "moduleName": "entry",
+      "moduleType": "entry",
+      "installationFree": false
+    },
+    "abilities": [
+      {
+        "skills": [
+          {
+            "entities": [
+              "entity.system.home"
+            ],
+            "actions": [
+              "action.system.home"
+            ]
+          }
+        ],
+        "orientation": "unspecified",
+        "visible": true,
+        "srcPath": "MainAbility",
+        "name": ".MainAbility",
+        "srcLanguage": "ets",
+        "icon": "$media:icon",
+        "description": "$string:description_mainability",
+        "formsEnabled": false,
+        "label": "$string:StringCodec",
+        "type": "page",
+        "launchType": "standard"
+      }
+    ],
+    "js": [
+      {
+        "mode": {
+          "syntax": "ets",
+          "type": "pageAbility"
+        },
+        "pages": [
+          "pages/index"
+        ],
+        "name": ".MainAbility",
+        "window": {
+          "designWidth": 720,
+          "autoDesignWidth": false
+        }
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/ETSUI/StringCodec/entry/src/main/ets/MainAbility/app.ets b/ETSUI/StringCodec/entry/src/main/ets/MainAbility/app.ets
new file mode 100644
index 0000000000000000000000000000000000000000..b7a0995c8e441cac86e21e06e7c9071664482b1c
--- /dev/null
+++ b/ETSUI/StringCodec/entry/src/main/ets/MainAbility/app.ets
@@ -0,0 +1,8 @@
+export default {
+  onCreate() {
+    console.info('Application onCreate')
+  },
+  onDestroy() {
+    console.info('Application onDestroy')
+  },
+}
\ No newline at end of file
diff --git a/ETSUI/StringCodec/entry/src/main/ets/MainAbility/pages/index.ets b/ETSUI/StringCodec/entry/src/main/ets/MainAbility/pages/index.ets
new file mode 100644
index 0000000000000000000000000000000000000000..9b49b2e3fe96819c92e49e62af3e3a79b750724f
--- /dev/null
+++ b/ETSUI/StringCodec/entry/src/main/ets/MainAbility/pages/index.ets
@@ -0,0 +1,260 @@
+import util from '@ohos.util'
+
+var resArray
+
+@Entry
+@Component
+struct StrCodec {
+
+  @State SpecStrInput_s: string = ''
+  @State SpecStrInput_d: string = ''
+  @State SpecStrInput_i: string = ''
+  @State SpecStrInput_f: string = ''
+
+  @State err_res01:string = ''
+  @State err_res02:string = ''
+  @State err_res03:string = ''
+  @State err_res04:string = ''
+  @State err_res05:string = ''
+
+  @State resen:string =''
+  @State resdec:string =''
+  @State read:string =''
+  @State write:string =''
+
+  build() {
+
+    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Start }) {
+      Text($r('app.string.StringCodec_title'))
+        .width('100%')
+        .height(50)
+        .backgroundColor("#0D9FFB")
+        .textAlign(TextAlign.Start)
+        .fontSize(25)
+        .fontColor(Color.White)
+        .fontWeight(FontWeight.Bold)
+        .padding({left:20,top:10})
+      Scroll(){
+        Column(){
+          Row(){
+            Text($r('app.string.SpecString'))
+              .fontSize(15)
+              .width(60)
+              .height(50)
+              .margin({top:20 })
+              .textAlign(TextAlign.Start)
+            Text($r('app.string.SpecString_info'))
+              .fontSize(15)
+              .width(200)
+              .height(50)
+              .margin({left:5,top:20 })
+              .textAlign(TextAlign.Start)
+          }
+          Row() {
+            Text($r('app.string.result_f')).width('30%').height(30).fontSize(15).textAlign(TextAlign.Start)
+            Text(this.SpecStrInput_f)
+              .width('70%')
+              .height(30)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+          Row() {
+            Text($r('app.string.result_i')).width('30%').height(30).fontSize(15).textAlign(TextAlign.Start)
+            Text(this.SpecStrInput_i)
+              .width('70%')
+              .height(30)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+          Row() {
+            Text($r('app.string.result_d')).width('30%').height(30).fontSize(15).textAlign(TextAlign.Start)
+            Text(this.SpecStrInput_d)
+              .width('70%')
+              .height(30)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+          Row() {
+            Text($r('app.string.result_s')).width('30%').height(30).fontSize(15).textAlign(TextAlign.Start)
+            Text(this.SpecStrInput_s)
+              .width('70%')
+              .height(30)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+          Button(){
+            Text($r('app.string.SpecFormOutput')).fontSize(15).fontWeight(FontWeight.Bold).fontColor(Color.White)
+          }
+          .width(300)
+          .margin({ top: 20 })
+          .onClick(() => {
+            this.SpecStrInput_f = util.printf("%f", $r('app.string.SpecString_info'));
+            this.SpecStrInput_i = util.printf("%i", $r('app.string.SpecString_info'));
+            this.SpecStrInput_d = util.printf("%d", $r('app.string.SpecString_info'));
+            this.SpecStrInput_s = util.printf("%s", "HarmonyOS 3.0");
+          })
+          .backgroundColor("#0D9FFB")
+
+
+          Text('').width('100%').height(10).backgroundColor("#0D9FFB").margin({top:20}).border({width:2,color:"#0D9FFB"})
+
+          Row() {
+            Text($r('app.string.num1')).width('20%').height(30).fontSize(15).textAlign(TextAlign.Start)
+            Text(this.err_res01)
+              .width('80%')
+              .height(30)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+
+          Row() {
+            Text($r('app.string.num2')).width('20%').height(30).fontSize(15).textAlign(TextAlign.Start)
+            Text(this.err_res02)
+              .width('80%')
+              .height(30)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+
+          Row() {
+            Text($r('app.string.num3')).width('20%').height(30).fontSize(15).textAlign(TextAlign.Start)
+            Text(this.err_res03)
+              .width('80%')
+              .height(30)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+
+          Row() {
+            Text($r('app.string.num4')).width('20%').height(30).fontSize(15).textAlign(TextAlign.Start)
+            Text(this.err_res04)
+              .width('80%')
+              .height(30)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+
+          Row() {
+            Text($r('app.string.num5')).width('20%').height(30).fontSize(15).textAlign(TextAlign.Start)
+            Text(this.err_res05)
+              .width('80%')
+              .height(30)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+
+          Button(){
+            Text($r('app.string.getErrorInfo')).fontColor(Color.White).fontSize(15).fontWeight(FontWeight.Bold)
+          }
+          .margin({ top: 20 })
+          .onClick(() => {
+            var errnum_01 = 10;
+            var errnum_02 = 20;
+            var errnum_03 = 100;
+            var errnum_04 = -10;
+            var errnum_05 = 1000;
+            this.err_res01 = util.getErrorString(errnum_01);
+            this.err_res02 = util.getErrorString(errnum_02);
+            this.err_res03 = util.getErrorString(errnum_03);
+            this.err_res04 = util.getErrorString(errnum_04);
+            this.err_res05 = util.getErrorString(errnum_05);
+          })
+          .backgroundColor("#0D9FFB")
+          .width(300)
+
+          Text('').width('100%').height(10).backgroundColor("#0D9FFB").margin({top:20}).border({width:2,color:"#0D9FFB"})
+
+          Row(){
+            Text($r('app.string.SpecString'))
+              .fontSize(15)
+              .width(60)
+              .height(50)
+              .margin({top:20 })
+              .textAlign(TextAlign.Start)
+            Text($r('app.string.StringCodec_info'))
+              .fontSize(15)
+              .width(240)
+              .height(50)
+              .margin({left:5,top:20 })
+              .textAlign(TextAlign.Start)
+          }
+          Row() {
+            Text($r('app.string.result')).width('20%').height(30).fontSize(15).textAlign(TextAlign.Start)
+            Text(this.resen)
+              .width('80%')
+              .height(60)
+              .fontSize(15)
+              .maxLines(2)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+          Row() {
+            Text($r('app.string.read')).width('20%').height(30).fontSize(15).textAlign(TextAlign.Start)
+            Text(this.read)
+              .width('30%')
+              .height(30)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+            Text($r('app.string.write')).width('20%').height(30).fontSize(15).textAlign(TextAlign.Center)
+            Text(this.write)
+              .width('30%')
+              .height(30)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+
+          Button(){
+            Text($r('app.string.Text_encoder')).fontColor(Color.White).fontSize(15).fontWeight(FontWeight.Bold)
+          }
+          .margin({ top: 20 })
+          .onClick(() => {
+            var textEncoder = new  util.TextEncoder()
+            var buffer = new ArrayBuffer(100)
+            resArray = new Uint8Array(buffer);
+            resArray = textEncoder.encode("HarmonyOS 3.0，未来有迹可循！");
+            var resArratNum = textEncoder.encodeInto("HarmonyOS 3.0，未来有迹可循！", resArray)
+            this.resen = resArray.toString();
+            this.read = JSON.stringify(resArratNum.read)
+            this.write = JSON.stringify(resArratNum. written)
+          })
+          .backgroundColor("#0D9FFB")
+          .width(300)
+
+          Row() {
+            Text($r('app.string.result')).width('20%').height(30).fontSize(15).textAlign(TextAlign.Start).fontColor(Color.Black)
+            Text(this.resdec)
+              .width('80%')
+              .height(60)
+              .fontSize(15)
+              .textAlign(TextAlign.Start)
+              .maxLines(2)
+              .border({width:2,radius:5,color:"#0D9FFB"})
+          }.margin({ top: 20 }).width(300)
+
+          Button(){
+            Text($r('app.string.Text_decoder')).fontColor(Color.White).fontSize(15).fontWeight(FontWeight.Bold)
+          }
+          .margin({ top: 20,bottom:50 })
+          .onClick(() => {
+            var textDecoder = new util.TextDecoder("utf-8",{ignoreBOM:true});
+            var retStr = textDecoder.decode( resArray  , {stream:false});
+            this.resdec = retStr;
+          })
+          .backgroundColor("#0D9FFB")
+          .width(300)
+        }
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/ETSUI/StringCodec/entry/src/main/resources/base/element/string.json b/ETSUI/StringCodec/entry/src/main/resources/base/element/string.json
new file mode 100644
index 0000000000000000000000000000000000000000..37ab372ff012ddefab3cb9630e9d17f899f61193
--- /dev/null
+++ b/ETSUI/StringCodec/entry/src/main/resources/base/element/string.json
@@ -0,0 +1,97 @@
+{
+  "string": [
+    {
+      "name": "StringCodec",
+      "value": "StringCodec"
+    },
+    {
+      "name": "description_mainability",
+      "value": "ETS_Empty Ability"
+    },
+    {
+      "name": "StringCodec_title",
+      "value": "字符串编解码"
+    },
+    {
+      "name": "StringName",
+      "value": "字符串"
+    },
+    {
+      "name": "SpecString",
+      "value": "字符串 : "
+    },
+    {
+      "name": "SpecString_info",
+      "value": "HarmonyOS 3.0"
+    },
+    {
+      "name": "result",
+      "value": "result = "
+    },
+    {
+      "name": "result_f",
+      "value": "result[%f] = "
+    },
+    {
+      "name": "result_i",
+      "value": "result[%i] = "
+    },
+    {
+      "name": "result_d",
+      "value": "result[%d] = "
+    },
+    {
+      "name": "result_s",
+      "value": "result[%s] = "
+    },
+    {
+      "name": "SpecFormOutput",
+      "value": "特定格式输出"
+    },
+    {
+      "name": "num1",
+      "value": "10"
+    },
+    {
+      "name": "num2",
+      "value": "20"
+    },
+    {
+      "name": "num3",
+      "value": "100"
+    },
+    {
+      "name": "num4",
+      "value": "-10"
+    },
+    {
+      "name": "num5",
+      "value": "1000"
+    },
+    {
+      "name": "getErrorInfo",
+      "value": "获取系统错误码对应的详细信息"
+    },
+    {
+      "name": "StringCodec_info",
+      "value": "HarmonyOS 3.0，未来有迹可循！"
+    },
+    {
+      "name": "read",
+      "value": "读取："
+    },
+    {
+      "name": "write",
+      "value": "写入："
+    },
+    {
+      "name": "Text_encoder",
+      "value": "文本编码器"
+    },
+    {
+      "name": "Text_decoder",
+      "value": "文本译码器"
+    }
+
+  ]
+}
\ No newline at end of file
diff --git a/ETSUI/StringCodec/entry/src/main/resources/base/media/icon.png b/ETSUI/StringCodec/entry/src/main/resources/base/media/icon.png
new file mode 100644
index 0000000000000000000000000000000000000000..ce307a8827bd75456441ceb57d530e4c8d45d36c
Binary files /dev/null and b/ETSUI/StringCodec/entry/src/main/resources/base/media/icon.png differ
diff --git a/ETSUI/StringCodec/screenshots/device/image1.png b/ETSUI/StringCodec/screenshots/device/image1.png
new file mode 100644
index 0000000000000000000000000000000000000000..9633f69101f88afacd5de7f83e69add93987a312
Binary files /dev/null and b/ETSUI/StringCodec/screenshots/device/image1.png differ
diff --git a/ETSUI/StringCodec/screenshots/device/image2.png b/ETSUI/StringCodec/screenshots/device/image2.png
new file mode 100644
index 0000000000000000000000000000000000000000..db878e288445a7a653a690fe997687b2b1da8509
Binary files /dev/null and b/ETSUI/StringCodec/screenshots/device/image2.png differ
diff --git a/ETSUI/StringCodec/settings.gradle b/ETSUI/StringCodec/settings.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..4773db73233a570c2d0c01a22e75321acfbf7a07
--- /dev/null
+++ b/ETSUI/StringCodec/settings.gradle
@@ -0,0 +1 @@
+include ':entry'