diff --git a/common/eTSUtilBase64Codec/README.md b/common/eTSUtilBase64Codec/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..4b2021aeebf9096ca224a958340621a2468e4fff
--- /dev/null
+++ b/common/eTSUtilBase64Codec/README.md
@@ -0,0 +1,15 @@
+# base64编解码
+
+### 简介
+
+Base64是一种基于64个可打印字符来表示二进制数据的方法，本示例展示了Base64编码及解码的结果输出
+
+### 使用说明
+
+1：点击**编码**按钮，将会把字符串转换为ASCII码，然后对ASCII码进行编码，并在文本框输出编码后的结果。
+
+2：点击**解码**按钮，将会把编码后输出的结果作为解码器的入参，解码后得到ASCII码数组，然后将ASCII码数组转换为字符串在文本框输出。
+
+### 约束与限制
+
+本示例仅支持在标准系统上运行。
\ No newline at end of file
diff --git a/common/eTSUtilBase64Codec/build.gradle b/common/eTSUtilBase64Codec/build.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..f350f30a90f962897ebab2c31e5bbf3e4868a578
--- /dev/null
+++ b/common/eTSUtilBase64Codec/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 8
+    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:3.0.5.2'
+        classpath 'com.huawei.ohos:decctest:1.2.7.2'
+    }
+}
+
+allprojects {
+    repositories {
+        maven {
+            url 'https://repo.huaweicloud.com/repository/maven/'
+        }
+        maven {
+            url 'https://developer.huawei.com/repo/'
+        }
+    }
+}
diff --git a/common/eTSUtilBase64Codec/entry/build.gradle b/common/eTSUtilBase64Codec/entry/build.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..05a33cd3adb09a68a581b9f7c02c57d3911630e8
--- /dev/null
+++ b/common/eTSUtilBase64Codec/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 8
+    defaultConfig {
+        compatibleSdkVersion 8
+    }
+    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/common/eTSUtilBase64Codec/entry/src/main/config.json b/common/eTSUtilBase64Codec/entry/src/main/config.json
new file mode 100644
index 0000000000000000000000000000000000000000..1848fa79343a357b7ec57e1c2683d04586797e85
--- /dev/null
+++ b/common/eTSUtilBase64Codec/entry/src/main/config.json
@@ -0,0 +1,67 @@
+{
+  "app": {
+    "bundleName": "ohos.samples.etsutilbase64codec",
+    "vendor": "example",
+    "version": {
+      "code": 1000000,
+      "name": "1.0.0"
+    }
+  },
+  "deviceConfig": {},
+  "module": {
+    "package": "ohos.samples.etsutilbase64codec",
+    "name": ".MyApplication",
+    "mainAbility": ".MainAbility",
+    "srcPath": "",
+    "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:entry_MainAbility",
+        "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/common/eTSUtilBase64Codec/entry/src/main/ets/MainAbility/app.ets b/common/eTSUtilBase64Codec/entry/src/main/ets/MainAbility/app.ets
new file mode 100644
index 0000000000000000000000000000000000000000..bf28e58b36cf11db491d3f00768ef2c9e41d05cf
--- /dev/null
+++ b/common/eTSUtilBase64Codec/entry/src/main/ets/MainAbility/app.ets
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2021 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export default {
+  onCreate() {
+    console.info('Application onCreate')
+  },
+  onDestroy() {
+    console.info('Application onDestroy')
+  },
+}
\ No newline at end of file
diff --git a/common/eTSUtilBase64Codec/entry/src/main/ets/MainAbility/pages/index.ets b/common/eTSUtilBase64Codec/entry/src/main/ets/MainAbility/pages/index.ets
new file mode 100644
index 0000000000000000000000000000000000000000..cf03e3cd5544978fc819ceb570c73cbcffb2b8af
--- /dev/null
+++ b/common/eTSUtilBase64Codec/entry/src/main/ets/MainAbility/pages/index.ets
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2021 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import util from '@ohos.util';
+
+@Entry
+@Component
+struct Index {
+  @State windows_en: string = ''
+  @State windows_de: string = ''
+  @State input: string = 'harmony'
+  private StrToAscii: number[] = []
+  private AsciiToStr: string = ''
+
+  build() {
+    Scroll() {
+      Column() {
+        Text($r("app.string.change_str") + this.input)
+          .width('90%')
+          .height('10%')
+          .textAlign(TextAlign.Center)
+          .fontSize(20)
+          .fontWeight(FontWeight.Bold)
+
+        Text(this.windows_en)
+          .width('90%')
+          .height('10%')
+          .margin({ top: 20 })
+          .padding({left:10})
+          .fontSize(20)
+          .fontWeight(FontWeight.Bold)
+          .border({ width: 2, radius: 10, color: Color.Black })
+
+        Button() {
+          Text($r("app.string.encode"))
+            .fontSize(25)
+            .fontWeight(FontWeight.Bold)
+        }
+        .width(300)
+        .height('10%')
+        .type(ButtonType.Capsule)
+        .margin({
+          top: 20
+        })
+        .backgroundColor('#0D9FFB')
+        .onClick(() => {
+          for (let i = 0;i < this.input.length; i++) {
+            this.StrToAscii.push(this.input.charCodeAt(i))
+          }
+          var that = new util.Base64();
+          var encodeNum = new Uint8Array(this.StrToAscii);
+          this.windows_en = that.encodeToStringSync(encodeNum)
+        })
+
+        Text(this.windows_de)
+          .width('90%')
+          .height('10%')
+          .fontSize(20)
+          .padding({left:10})
+          .fontWeight(FontWeight.Bold)
+          .border({ width: 2, radius: 10, color: Color.Black })
+          .margin({ top: 50 })
+
+        Button() {
+          Text($r("app.string.decode"))
+            .fontSize(25)
+            .fontWeight(FontWeight.Bold)
+        }
+        .width(300)
+        .height('10%')
+        .type(ButtonType.Capsule)
+        .margin({
+          top: 20
+        })
+        .backgroundColor('#0D9FFB')
+        .onClick(() => {
+          var that = new util.Base64();
+          var decodeNum = that.decodeSync(this.windows_en);
+          for (let i = 0; i < decodeNum.length; i++) {
+            this.AsciiToStr += String.fromCharCode(decodeNum[i])
+          }
+          this.windows_de = this.AsciiToStr
+        })
+      }
+    }
+    .scrollBar(BarState.Off)
+    .width('100%')
+    .height('100%')
+  }
+}
\ No newline at end of file
diff --git a/common/eTSUtilBase64Codec/entry/src/main/resources/base/element/string.json b/common/eTSUtilBase64Codec/entry/src/main/resources/base/element/string.json
new file mode 100644
index 0000000000000000000000000000000000000000..26d507690b7f98cee90a8be7b409ea6157cdbab2
--- /dev/null
+++ b/common/eTSUtilBase64Codec/entry/src/main/resources/base/element/string.json
@@ -0,0 +1,24 @@
+{
+  "string": [
+    {
+      "name": "entry_MainAbility",
+      "value": "entry_MainAbility"
+    },
+    {
+      "name": "description_mainability",
+      "value": "eTS_Empty Ability"
+    },
+    {
+      "name": "change_str",
+      "value": "要转换的字符串:"
+    },
+    {
+      "name": "encode",
+      "value": "编码"
+    },
+    {
+      "name": "decode",
+      "value": "解码"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/common/eTSUtilBase64Codec/entry/src/main/resources/base/media/icon.png b/common/eTSUtilBase64Codec/entry/src/main/resources/base/media/icon.png
new file mode 100644
index 0000000000000000000000000000000000000000..ce307a8827bd75456441ceb57d530e4c8d45d36c
Binary files /dev/null and b/common/eTSUtilBase64Codec/entry/src/main/resources/base/media/icon.png differ
diff --git a/common/eTSUtilBase64Codec/screenshots/device/base.png b/common/eTSUtilBase64Codec/screenshots/device/base.png
new file mode 100644
index 0000000000000000000000000000000000000000..39b873ed391b78798484ad1926508454fe0a762e
Binary files /dev/null and b/common/eTSUtilBase64Codec/screenshots/device/base.png differ
diff --git a/common/eTSUtilBase64Codec/settings.gradle b/common/eTSUtilBase64Codec/settings.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..4773db73233a570c2d0c01a22e75321acfbf7a07
--- /dev/null
+++ b/common/eTSUtilBase64Codec/settings.gradle
@@ -0,0 +1 @@
+include ':entry'