diff --git a/src/aspects/AspectDict.ts b/src/aspects/AspectDict.ts
index 7b23674b0..d26e9f44b 100644
--- a/src/aspects/AspectDict.ts
+++ b/src/aspects/AspectDict.ts
@@ -1,7 +1,7 @@
 import { NativeEnv, WebEnv, WechatMpEnv } from 'oak-domain/lib/types/Environment';
 import { AppType } from '../oak-app-domain/Application/Schema';
 import { EntityDict } from '../oak-app-domain';
-import { Config, Origin } from '../types/Config';
+import { Config, AccountOrigin } from '../types/Config';
 import { Style } from '../types/Style';
 import { MediaType, MaterialType } from '../types/WeChat';
 import { BackendRuntimeContext } from '../context/BackendRuntimeContext';
diff --git a/src/entities/Application.ts b/src/entities/Application.ts
index 4a43591e4..8d180f961 100644
--- a/src/entities/Application.ts
+++ b/src/entities/Application.ts
@@ -6,6 +6,7 @@ import { Schema as Domain } from './Domain';
 
 import { Style } from '../types/Style';
 import { EntityDesc } from 'oak-domain/lib/types/EntityDesc';
+import { CosOrigin } from '../types/Config';
 
 export type AppType = 'web' | 'wechatMp' | 'wechatPublic' | 'native';
 export type WechatMpConfig = {
@@ -21,6 +22,9 @@ export type WechatMpConfig = {
         mode: 'clear' | 'compatible' | 'safe'; //消息加解密方式 明文模式 兼容模式 安全模式
         dataFormat: 'json' | 'xml';
     };
+    cos?: {
+        defaultOrigin: CosOrigin; //默认使用的cos存储源
+    };
 };
 
 export type WebConfig = {
@@ -39,7 +43,10 @@ export type WebConfig = {
         protocol: 'http:' | 'https:';
         hostname: string;
         port: string;
-    }
+    };
+    cos?: {
+        defaultOrigin: CosOrigin; //默认使用的cos存储源
+    };
 };
 
 
@@ -64,7 +71,10 @@ export type WechatPublicConfig = {
         protocol: 'http:' | 'https:';
         hostname: string;
         port: string;
-    }
+    };
+    cos?: {
+        defaultOrigin: CosOrigin; //默认使用的cos存储源
+    };
 };
 
 export type NativeConfig = {
@@ -78,7 +88,10 @@ export type NativeConfig = {
         protocol: 'http:' | 'https:';
         hostname: string;
         port: string;
-    }
+    };
+    cos?: {
+        defaultOrigin: CosOrigin; //默认使用的cos存储源
+    };
 };
 
 type Versions = string[];
diff --git a/src/entities/ExtraFile.ts b/src/entities/ExtraFile.ts
index 5981ca0f6..a18f3fcae 100644
--- a/src/entities/ExtraFile.ts
+++ b/src/entities/ExtraFile.ts
@@ -2,9 +2,10 @@ import { String, Int, Text, Float, Boolean } from 'oak-domain/lib/types/DataType
 import { EntityShape } from 'oak-domain/lib/types/Entity';
 import { EntityDesc } from 'oak-domain/lib/types/EntityDesc';
 import { Schema as Application } from './Application';
+import { CosOrigin } from '../types/Config';
 
 export interface Schema extends EntityShape {
-    origin: 'qiniu' | 'wechat' | 'ctyun' | 'aliyun' | 'tencent' | 'local' | 'unknown' | 's3';
+    origin: CosOrigin;
     type: 'image' | 'video' | 'audio' | 'file';
     bucket?: String<32>; // 七牛、腾讯、阿里、天翼，其它cos可忽略
     objectId?: String<64>; // 七牛、腾讯、阿里、天翼，其它cos可忽略
diff --git a/src/triggers/extraFile.ts b/src/triggers/extraFile.ts
index c43a21f52..10b3eeec5 100644
--- a/src/triggers/extraFile.ts
+++ b/src/triggers/extraFile.ts
@@ -6,6 +6,7 @@ import { OakException } from 'oak-domain/lib/types/Exception';
 import { RemoveTrigger } from 'oak-domain/lib/types/Trigger';
 import { BRC } from '../types/RuntimeCxt';
 import { applicationProjection } from '../types/Projection';
+import assert from 'assert';
 
 const triggers: Trigger<EntityDict, 'extraFile', BRC<EntityDict>>[] = [
     {
@@ -16,20 +17,56 @@ const triggers: Trigger<EntityDict, 'extraFile', BRC<EntityDict>>[] = [
         fn: async ({ operation }, context) => {
             const { data } = operation;
 
+            const [application] = await context.select("application", {
+                data: {
+                    config: {
+                        cos: {
+                            defaultOrigin: 1,
+                        }
+                    },
+                    system: {
+                        config: {
+                            Cos: {
+                                defaultOrigin: 1,
+                            }
+                        },
+                        platform: {
+                            config: {
+                                Cos: {
+                                    defaultOrigin: 1,
+                                }
+                            }
+                        }
+                    }
+                },
+                filter: {
+                    id: context.getApplicationId()!,
+                },
+            }, {});
+
+            assert(application, `找不到 当前应用程序`);
+
             const formMeta = async (data: EntityDict['extraFile']['OpSchema']): Promise<void> => {
-                const { origin } = data;
+
+                const configOrigin = data.origin ||
+                    application!.config?.cos?.defaultOrigin ||
+                    application!.system?.config?.Cos?.defaultOrigin ||
+                    application!.system?.platform?.config?.Cos?.defaultOrigin;
+
+                assert(configOrigin, `extraFile的origin未指定，且应用程序、系统配置、平台配置中也没有默认的Cos源，请检查`);
+
                 if (!data.applicationId) {
                     data.applicationId = context.getApplicationId()!;
                 }
-                if (origin === 'unknown') {
+                if (configOrigin === 'unknown') {
                     Object.assign(data, {
                         uploadState: 'success',
                     });
                     return;
                 }
-                const cos = getCosBackend(origin!);
+                const cos = getCosBackend(configOrigin!);
                 if (!cos) {
-                    throw new OakException(`origin为${origin}的extraFile没有定义Cos类，请调用registerCos注入`);
+                    throw new OakException(`origin为${configOrigin}的extraFile没有定义Cos类，请调用registerCos注入`);
                 }
                 await cos.formUploadMeta(context.getApplication() as EntityDict['application']['Schema'], data);
                 Object.assign(data, {
diff --git a/src/types/Config.ts b/src/types/Config.ts
index 74167dc4c..75eea59dc 100644
--- a/src/types/Config.ts
+++ b/src/types/Config.ts
@@ -204,6 +204,7 @@ export type Config = {
         tencent?: TencentYunCosConfig;
         local?: LocalCosConfig;
         s3?: S3CosConfig;
+        defaultOrigin?: CosOrigin; //默认存储源
     };
     Live?: {
         qiniu?: QiniuLiveConfig;
@@ -238,5 +239,6 @@ export type Config = {
     }
 };
 
-export type Origin = 'ali' | 'tencent' | 'qiniu' | 'amap' | 'ctyun' | 'local';
+export type AccountOrigin = 'ali' | 'tencent' | 'qiniu' | 'amap' | 'ctyun' | 'local' | 's3';
+export type CosOrigin = 'qiniu' | 'wechat' | 'ctyun' | 'aliyun' | 'tencent' | 'local' | 'unknown' | 's3';
 export type Service = 'Map' | 'Cos' | 'Live' | 'Sms' | 'Emails';
\ No newline at end of file
diff --git a/src/utils/getContextConfig.ts b/src/utils/getContextConfig.ts
index e0a26d24c..fcd7f93b2 100644
--- a/src/utils/getContextConfig.ts
+++ b/src/utils/getContextConfig.ts
@@ -1,16 +1,17 @@
 import { assert } from 'oak-domain/lib/utils/assert';
 import { OakDataException } from 'oak-domain/lib/types/Exception';
-import { AmapSDK, QiniuSDK, CTYunSDK, ALiYunSDK, TencentYunSDK, LocalSDK } from 'oak-external-sdk';
+import { AmapSDK, QiniuSDK, CTYunSDK, ALiYunSDK, TencentYunSDK, LocalSDK, S3SDK } from 'oak-external-sdk';
 import {
     AliCloudConfig,
     AmapCloudConfig,
-    Origin,
+    AccountOrigin,
     QiniuCloudConfig,
     Service,
     TencentCloudConfig,
     CTYunCloudConfig,
     Config,
     LocalCloudConfig,
+    S3AccountConfig,
 } from '../types/Config';
 
 /**
@@ -19,7 +20,7 @@ import {
  * @param origin 
  * @returns 
  */
-export function getConfig(systemConfig: Config, service: Service, origin: Origin) {
+export function getConfig(systemConfig: Config, service: Service, origin: AccountOrigin) {
     const serviceConfig = systemConfig[service];
     let originConfig = serviceConfig && (serviceConfig as any)[origin];
     let originCloudAccounts = originConfig && systemConfig.Account && systemConfig.Account[origin];
@@ -115,6 +116,23 @@ export function getConfig(systemConfig: Config, service: Service, origin: Origin
                 config: originConfig,
             };
         }
+        case 's3': {
+            const s3Account = (
+                originCloudAccounts as S3AccountConfig[]
+            ).find((ele) => ele.accessKey === originConfig.accessKey);
+            assert(
+                s3Account,
+                `调用的服务${service}源${origin}找不到相应的平台帐号，请联系管理员`
+            );
+            const s3Instance = S3SDK.getInstance(
+                s3Account!.accessKey,
+                s3Account!.secretKey
+            );
+            return {
+                instance: s3Instance,
+                config: originConfig,
+            };
+        }
         default: {
             assert(origin === 'amap');
             const amapAccount = (originCloudAccounts as AmapCloudConfig[]).find(
diff --git a/src/utils/livestream.ts b/src/utils/livestream.ts
index 754d85f38..d531b1bf8 100644
--- a/src/utils/livestream.ts
+++ b/src/utils/livestream.ts
@@ -2,7 +2,7 @@ import { EntityDict as BaseEntityDict } from 'oak-domain/lib/types/Entity';
 import { assert } from 'oak-domain/lib/utils/assert';
 import { EntityDict } from '../oak-app-domain';
 import { Schema as Livestream } from '../oak-app-domain/Livestream/Schema';
-import { Origin, QiniuLiveConfig } from '../types/Config';
+import { AccountOrigin, QiniuLiveConfig } from '../types/Config';
 import { getConfig } from './getContextConfig';
 import { QiniuCloudInstance } from 'oak-external-sdk/es/service/qiniu/QiniuCloud';
 import { BackendRuntimeContext } from '../context/BackendRuntimeContext';
@@ -17,7 +17,7 @@ import { cloneDeep } from 'oak-domain/lib/utils/lodash';
  */
 export async function getLivestream<ED extends EntityDict & BaseEntityDict, Cxt extends BackendRuntimeContext<ED>>(
     params: {
-        origin: Origin;
+        origin: AccountOrigin;
         streamTitle: string,
         expireAt: number,
     },
@@ -61,7 +61,7 @@ export async function getLivestream<ED extends EntityDict & BaseEntityDict, Cxt
  */
 export async function getStreamObj<ED extends EntityDict & BaseEntityDict, Cxt extends BackendRuntimeContext<ED>>(
     params: {
-        origin: Origin;
+        origin: AccountOrigin;
         streamTitle: string;
         expireAt: number;
     },
@@ -98,7 +98,7 @@ export async function getStreamObj<ED extends EntityDict & BaseEntityDict, Cxt e
 // 生成直播回放
 export async function getPlayBackUrl<ED extends EntityDict & BaseEntityDict, Cxt extends BackendRuntimeContext<ED>>(
     params: {
-        origin: Origin;
+        origin: AccountOrigin;
         streamTitle: string;
         start: number;
         end: number;