diff --git a/src/platforms/core.ts b/src/platforms/core.ts
index a2d01e1..29191be 100644
--- a/src/platforms/core.ts
+++ b/src/platforms/core.ts
@@ -164,4 +164,9 @@ export abstract class UserInfo {
   abstract getUserProfile(): Promise<IUserProfile>;
   abstract login(): Promise<ILogin>;
   abstract checkSession(): Promise<ICheckSession>;
+}
+
+
+export abstract class Media {
+  abstract downloadFile(url: string): Promise<void>;
 }
\ No newline at end of file
diff --git a/src/platforms/factory.ts b/src/platforms/factory.ts
index 91e7ea8..b05692a 100644
--- a/src/platforms/factory.ts
+++ b/src/platforms/factory.ts
@@ -1,6 +1,6 @@
-import { RewardedVideoAdTT, UserInfoTT } from "./tt";
-import { RewardedVideoAd, UserInfo } from "./core";
-import { RewardedVideoAdWeApp, UserInfoWeApp } from "./weapp";
+import { MediaTT, RewardedVideoAdTT, UserInfoTT } from "./tt";
+import { Media, RewardedVideoAd, UserInfo } from "./core";
+import { MediaWeApp, RewardedVideoAdWeApp, UserInfoWeApp } from "./weapp";
 
 /**
  * 小程序平台全局对象类型声明
@@ -58,6 +58,24 @@ export class PlatformFactory {
   }
 
 
+  createMedia(): Media {
+    switch (this.platform) {
+      case 'tt':
+        return new MediaTT();
+      case 'weapp':
+        throw new MediaWeApp();
+      case 'alipay':
+        throw new Error(`支付宝小程序平台暂未实现`);
+      case 'swan':
+        throw new Error(`百度智能小程序平台暂未实现`);
+      case 'qq':
+        throw new Error(`QQ 小程序平台暂未实现`);
+      default:
+        throw new Error(`不支持的平台类型: ${this.platform}`);
+    }
+  }
+
+
   createUserInfo(): UserInfo {
     switch (this.platform) {
       case 'tt':
diff --git a/src/platforms/tt.ts b/src/platforms/tt.ts
index 8c287c4..a4b4923 100644
--- a/src/platforms/tt.ts
+++ b/src/platforms/tt.ts
@@ -6,7 +6,8 @@ import {
   RewardedVideoAdOptions,
   UserInfo,
   IUserProfile,
-  ICheckSession
+  ICheckSession,
+  Media
 } from "./core";
 
 /**
@@ -70,7 +71,7 @@ export class RewardedVideoAdTT extends RewardedVideoAd {
    * @returns Promise<void> 加载完成的 Promise
    */
   async load(): Promise<void> {
-    if(!this.ad) return;
+    if (!this.ad) return;
     try {
       await this.ad.load();
       this._isReady = true;
@@ -85,7 +86,7 @@ export class RewardedVideoAdTT extends RewardedVideoAd {
    * @returns Promise<void> 展示完成的 Promise
    */
   async show(): Promise<void> {
-    if(!this.ad) return;
+    if (!this.ad) return;
     if (!this._isReady) {
       throw new Error('广告尚未加载完成，请先调用 load() 方法或等待广告加载完成');
     }
@@ -97,7 +98,7 @@ export class RewardedVideoAdTT extends RewardedVideoAd {
    * @returns Promise<void> 销毁完成的 Promise
    */
   async destroy(): Promise<void> {
-    if(!this.ad) return;
+    if (!this.ad) return;
     this._isReady = false;
     if (this.ad.destroy) {
       return this.ad.destroy();
@@ -114,7 +115,7 @@ export class RewardedVideoAdTT extends RewardedVideoAd {
    * @param cb 关闭事件回调函数
    */
   onClose(cb: RewardedVideoCloseCb): void {
-    if(!this.ad) return;
+    if (!this.ad) return;
     this.ad.onClose(cb);
   }
 
@@ -123,7 +124,7 @@ export class RewardedVideoAdTT extends RewardedVideoAd {
    * @param cb 需要移除的关闭事件回调函数
    */
   offClose(cb: RewardedVideoCloseCb): void {
-    if(!this.ad) return;
+    if (!this.ad) return;
     this.ad.offClose(cb);
   }
 
@@ -132,7 +133,7 @@ export class RewardedVideoAdTT extends RewardedVideoAd {
    * @param cb 错误事件回调函数
    */
   onError(cb: RewardedVideoErrorCb): void {
-    if(!this.ad) return;
+    if (!this.ad) return;
     this.ad.onError(cb);
   }
 
@@ -141,7 +142,7 @@ export class RewardedVideoAdTT extends RewardedVideoAd {
    * @param cb 需要移除的错误事件回调函数
    */
   offError(cb: RewardedVideoErrorCb): void {
-    if(!this.ad) return;
+    if (!this.ad) return;
     this.ad.offError(cb);
   }
 
@@ -150,7 +151,7 @@ export class RewardedVideoAdTT extends RewardedVideoAd {
    * @param cb 加载成功事件回调函数
    */
   onLoad(cb: RewardedVideoLoadCb): void {
-    if(!this.ad) return;
+    if (!this.ad) return;
     this.ad.onLoad(cb);
   }
 
@@ -159,7 +160,7 @@ export class RewardedVideoAdTT extends RewardedVideoAd {
    * @param cb 需要移除的加载成功事件回调函数
    */
   offLoad(cb: RewardedVideoLoadCb): void {
-    if(!this.ad) return;
+    if (!this.ad) return;
     this.ad.offLoad(cb);
   }
 
@@ -239,4 +240,19 @@ export class UserInfoTT extends UserInfo {
       })
     })
   }
+}
+
+
+export class MediaTT extends Media {
+  downloadFile(url: string): Promise<void> {
+    return new Promise((resolve, reject) => {
+      tt.downloadFile({
+        url, success: (res: any) => {
+          resolve(res)
+        }, fail: (res: any) => {
+          reject(res)
+        }
+      })
+    })
+  }
 }
\ No newline at end of file
diff --git a/src/platforms/weapp.ts b/src/platforms/weapp.ts
index 21f3db7..a41a238 100644
--- a/src/platforms/weapp.ts
+++ b/src/platforms/weapp.ts
@@ -6,7 +6,8 @@ import {
     RewardedVideoAdOptions,
     UserInfo,
     IUserProfile,
-    ICheckSession
+    ICheckSession,
+    Media
 } from "./core";
 
 /**
@@ -238,4 +239,19 @@ export class UserInfoWeApp extends UserInfo {
             })
         })
     }
+}
+
+
+export class MediaWeApp extends Media {
+    downloadFile(url: string): Promise<void> {
+        return new Promise((resolve, reject) => {
+            wx.downloadFile({
+                url, success: (res: any) => {
+                    resolve(res)
+                }, fail: (res: any) => {
+                    reject(res)
+                }
+            })
+        })
+    }
 }
\ No newline at end of file