diff --git a/package.json b/package.json
index 9ab868b0b30c6c48338886e9570cbdb83615e79d..52a142a1c40968a89eceb8ab46bb9bdd4049dfe9 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
         "@vue/test-utils": "^1.0.0-beta.25",
         "babel-eslint": "^10.0.1",
         "babylon": "^6.18.0",
+        "base64-arraybuffer": "^0.2.0",
         "browserslist": "^4.4.2",
         "caniuse-lite": "^1.0.30000940",
         "chai": "^4.1.2",
@@ -59,8 +60,8 @@
         "globals": {
             "App": true,
             "Page": true,
-            "Component": true,
-            "Behavior":true,
+            "Component": true,
+            "Behavior": true,
             "getApp": true,
             "getCurrentPages": true,
             "plus": true,
@@ -76,8 +77,8 @@
             "__PLATFORM__": true,
             "__VERSION__": true,
             "__GLOBAL__": true,
-            "__PLATFORM_TITLE__": true,
-            "__PLATFORM_PREFIX__":true
+            "__PLATFORM_TITLE__": true,
+            "__PLATFORM_PREFIX__": true
         },
         "rules": {
             "no-tabs": 0,
diff --git a/src/core/helpers/promise.js b/src/core/helpers/promise.js
index f237401716314169a5774693c26ecd0e50d5a9e0..f83f3cc15d5b77d8f6c426fd36f8fa565e881689 100644
--- a/src/core/helpers/promise.js
+++ b/src/core/helpers/promise.js
@@ -2,7 +2,7 @@ import {
   isFn
 } from 'uni-shared'
 
-const SYNC_API_RE = /subNVue|requireNativePlugin|upx2px|hideKeyboard|canIUse|^create|Sync$|Manager$/
+const SYNC_API_RE = /subNVue|requireNativePlugin|upx2px|hideKeyboard|canIUse|^create|Sync$|Manager$|base64ToArrayBuffer|arrayBufferToBase64/
 
 const CONTEXT_API_RE = /^create|Manager$/
 
@@ -56,18 +56,18 @@ export function promisify (name, api) {
         success: resolve,
         fail: reject
       }), ...params)
-      /* eslint-disable no-extend-native */
-      if (!Promise.prototype.finally) {
-        Promise.prototype.finally = function (callback) {
-          const promise = this.constructor
-          return this.then(
-            value => promise.resolve(callback()).then(() => value),
-            reason => promise.resolve(callback()).then(() => {
-              throw reason
-            })
-          )
-        }
+      /* eslint-disable no-extend-native */
+      if (!Promise.prototype.finally) {
+        Promise.prototype.finally = function (callback) {
+          const promise = this.constructor
+          return this.then(
+            value => promise.resolve(callback()).then(() => value),
+            reason => promise.resolve(callback()).then(() => {
+              throw reason
+            })
+          )
+        }
       }
     }))
   }
-}
+}
diff --git a/src/core/helpers/protocol/base64.js b/src/core/helpers/protocol/base64.js
new file mode 100644
index 0000000000000000000000000000000000000000..9513a7a98dbd0639b7bdafb6f8b41fc07f8acb39
--- /dev/null
+++ b/src/core/helpers/protocol/base64.js
@@ -0,0 +1,11 @@
+export const base64ToArrayBuffer = [{
+  name: 'base64',
+  type: String,
+  required: true
+}]
+
+export const arrayBufferToBase64 = [{
+  name: 'arrayBuffer',
+  type: [ArrayBuffer, Uint8Array],
+  required: true
+}]
diff --git a/src/core/service/api/base64.js b/src/core/service/api/base64.js
new file mode 100644
index 0000000000000000000000000000000000000000..3164fe4c187e52a57f347594c9af24890fab8c22
--- /dev/null
+++ b/src/core/service/api/base64.js
@@ -0,0 +1,4 @@
+import { encode, decode } from 'base64-arraybuffer'
+
+export const base64ToArrayBuffer = decode
+export const arrayBufferToBase64 = encode