diff --git a/assets/script/game/common/GameDataSync.ts b/assets/script/game/common/GameDataSync.ts
index 27d71f90..65533871 100644
--- a/assets/script/game/common/GameDataSync.ts
+++ b/assets/script/game/common/GameDataSync.ts
@@ -94,60 +94,65 @@ export class GameDataSync {
     }
 
     /**
-     * 将获取到的云端数据与本地对比并合并
+     * 登录阶段与云端双向同步数据（sync 模式）。
+     * 时间戳对比在云端完成：
+     * - 本地较新：云端已被本地数据覆盖，无需额外处理
+     * - 云端较新：用云端数据覆盖本地，并写入 localStorage
+     * @returns true=本次以云端数据为准覆盖了本地；false=以本地数据为准或同步失败
      */
-    public syncWithCloudData(cloudData: CloudData | null) {
+    public async syncFromCloud(): Promise<boolean> {
         const localData = this.loadFromLocal();
 
-        let cloudTs = cloudData?.data?.timestamp || 0;
-        let localTs = localData?.timestamp || 0;
-
-        if (!localData || cloudTs > localTs) {
-            mLogger.log(this.debugMode, 'GameDataSync', `[GameDataSync]: 云端数据较新 (Cloud: ${cloudTs} > Local: ${localTs}), 执行覆盖。`);
-            if (cloudData) {
-                smc.overrideLocalDataWithRemote(cloudData);
-                this.saveToLocal(); // 同步到本地
-            }
-        } else {
-            mLogger.log(this.debugMode, 'GameDataSync', `[GameDataSync]: 本地数据较新 (Local: ${localTs} >= Cloud: ${cloudTs}), 使用本地数据，触发强制云同步。`);
-            smc.overrideLocalDataWithRemote({ data: localData });
-            // 本地数据较新，需要强制推送到云端以保证多端一致
-            this._localDataDirty = true;
-            this.executeCloudSync();
-        }
-    }
-
-    public getCloudData() {
-        const localData = this.loadFromLocal();
-        
-        // 未登录微信云端前，先用本地数据顶上（让玩家秒进游戏）
-        if (localData && !this.isWxClient()) {
-            smc.overrideLocalDataWithRemote({ data: localData });
-            return Promise.resolve(false);
-        }
-
-        return WxCloudApi.get().then(async (result) => { 
-            if(result.result.code === 200) {
-                let cloudData = result.result.data as CloudData;
-                mLogger.log(this.debugMode, 'GameDataSync', `[GameDataSync]: 获取游戏云端数据成功:`, cloudData);
-                
-                this.syncWithCloudData(cloudData);
-
-                return true;
-            } else {
-                mLogger.warn(this.debugMode, 'GameDataSync', `[GameDataSync]: 获取游戏云端数据失败，使用本地缓存兜底。`);
-                if (localData) {
-                    smc.overrideLocalDataWithRemote({ data: localData });
-                }
-                return false;
-            }
-        }).catch((error) => {
-            mLogger.error(this.debugMode, 'GameDataSync', `[GameDataSync]: 获取游戏云端数据异常:`, error);
+        // 非微信客户端：仅使用本地缓存
+        if (!this.isWxClient()) {
             if (localData) {
                 smc.overrideLocalDataWithRemote({ data: localData });
             }
             return false;
-        });
+        }
+
+        try {
+            // 本地无缓存时用空对象参与对比，云端会直接下发
+            const gameData = localData || ({} as GameDate);
+            gameData.timestamp = gameData.timestamp || 0;
+
+            const result = await WxCloudApi.sync(gameData);
+            const response = result.result;
+
+            if (response && response.code === 200 && response.data) {
+                const cloudData: CloudData = {
+                    openid: response.data.openid || '',
+                    data: (response.data.game_data || {}) as GameDate,
+                };
+
+                if (response.updated) {
+                    // 本地数据较新，云端已被覆盖
+                    mLogger.log(this.debugMode, 'GameDataSync', `[GameDataSync]: 本地数据较新，已覆盖云端。`);
+                    if (localData) {
+                        smc.overrideLocalDataWithRemote({ data: localData });
+                    }
+                    return false;
+                } else {
+                    // 云端数据较新，覆盖本地
+                    mLogger.log(this.debugMode, 'GameDataSync', `[GameDataSync]: 云端数据较新，覆盖本地。`);
+                    smc.overrideLocalDataWithRemote(cloudData);
+                    this.saveToLocal();
+                    return true;
+                }
+            }
+
+            mLogger.warn(this.debugMode, 'GameDataSync', `[GameDataSync]: 云端同步失败，使用本地缓存兜底。`, response?.msg);
+            if (localData) {
+                smc.overrideLocalDataWithRemote({ data: localData });
+            }
+            return false;
+        } catch (error) {
+            mLogger.error(this.debugMode, 'GameDataSync', `[GameDataSync]: 云端同步异常，使用本地缓存兜底。`, error);
+            if (localData) {
+                smc.overrideLocalDataWithRemote({ data: localData });
+            }
+            return false;
+        }
     }
 }
 
diff --git a/assets/script/game/common/SingletonModuleComp.ts b/assets/script/game/common/SingletonModuleComp.ts
index 0dbd2ee5..73dda1d3 100644
--- a/assets/script/game/common/SingletonModuleComp.ts
+++ b/assets/script/game/common/SingletonModuleComp.ts
@@ -228,7 +228,7 @@ export class SingletonModuleComp extends ecs.Comp {
     }
 
     getCloudData() {
-        gameDataSync.getCloudData();
+        gameDataSync.syncFromCloud();
     }
     public async overrideLocalDataWithRemote(cloudData: any) {
         try {
diff --git a/assets/script/game/initialize/Initialize.ts b/assets/script/game/initialize/Initialize.ts
index 9ded4c91..9fae7416 100644
--- a/assets/script/game/initialize/Initialize.ts
+++ b/assets/script/game/initialize/Initialize.ts
@@ -128,44 +128,21 @@ export class Initialize extends ecs.Entity {
     }
 
     /**
-     * 从云端加载数据（微信客户端）
+     * 从云端加载数据（微信客户端，sync 模式）
      */
     private async loadFromCloud() {
         try {
             // 1. 初始化微信云环境
             this.initWxCloudEnv();
 
-            // 2. 登录并获取云端数据
-            const loginResult = await WxCloudApi.login();
-            const response = loginResult.result;
-
-            if (response && response.code === 200) {
-                mLogger.log(this.debugMode, 'Initialize', "[Initialize]: 云端登录成功");
-
-                const cloudData = response.data;
-
-                if (cloudData && cloudData.openid) {
-                    smc.data.openid = cloudData.openid;
-                }
-
-                // 将 login 获取的 game_data 封装为统一下发格式，交给 gameDataSync 对比与合并
-                const formattedCloudData = {
-                    openid: cloudData?.openid || '',
-                    data: cloudData?.game_data || {}
-                };
-
-                gameDataSync.syncWithCloudData(formattedCloudData);
-
-            } else {
-                mLogger.log(this.debugMode, 'Initialize', "[Initialize]: 云端登录失败:", response?.msg);
-                // 登录失败时使用本地数据
-                gameDataSync.syncWithCloudData(null);
-            }
+            // 2. 一次调用完成登录与双向数据同步（时间戳对比在云端完成）
+            const cloudNewer = await gameDataSync.syncFromCloud();
+            mLogger.log(this.debugMode, 'Initialize', `[Initialize]: 云端同步完成，云端数据较新=${cloudNewer}`);
 
         } catch (error) {
             mLogger.log(this.debugMode, 'Initialize', "[Initialize]: 云端数据加载异常:", error);
             // 异常时使用本地数据兜底
-            gameDataSync.syncWithCloudData(null);
+            await gameDataSync.syncFromCloud();
         }
     }
 
@@ -174,8 +151,8 @@ export class Initialize extends ecs.Entity {
      */
     private async loadFromLocalDebug() {
         try {
-            // 用本地调试数据覆盖客户端数据
-            gameDataSync.syncWithCloudData(null);
+            // 非微信客户端仅使用本地缓存数据
+            await gameDataSync.syncFromCloud();
         } catch (error) {
             mLogger.log(this.debugMode, 'Initialize', "[Initialize]: 本地调试数据加载异常:", error);
         }
diff --git a/assets/script/game/wx_clound_client_api/WxCloudApi.ts b/assets/script/game/wx_clound_client_api/WxCloudApi.ts
index 22e5e49b..2a9c419d 100644
--- a/assets/script/game/wx_clound_client_api/WxCloudApi.ts
+++ b/assets/script/game/wx_clound_client_api/WxCloudApi.ts
@@ -91,4 +91,32 @@ export class WxCloudApi{
             }
         });
     }
+
+    /**
+     * @en Sync game data with the cloud (two-way, timestamp-based)
+     * @zh 与云端双向同步游戏数据：客户端较新则上传覆盖云端，云端较新则返回云端数据
+     * @param gameData 本地游戏数据（需包含 timestamp 字段）
+     * @return 返回结果
+     *  result.result = {
+     *      code: number,   // 200成功，其他都是失败
+     *      msg?: string,   // 失败原因
+     *      updated: boolean, // true=云端已被本地数据覆盖；false=客户端应使用返回的云端数据
+     *      data: {
+     *          openid: string,
+     *          game_data: object, // 同步后的最终数据
+     *      }
+     *  }
+     */
+    public static async sync(gameData: any): Promise<CloudCallFunctionResult<CloudReturnType<{
+        openid: string,
+        game_data: any
+    }> & { updated: boolean }>> {
+        return await wx?.cloud.callFunction({
+            name: 'cocos_cloud',
+            data: {
+                cmd: 'sync',
+                data: gameData
+            }
+        });
+    }
 }
\ No newline at end of file
diff --git a/build-templates/wechatgame/cloud_functions/cocos_cloud/index.js b/build-templates/wechatgame/cloud_functions/cocos_cloud/index.js
index e94f1fcf..f8720146 100644
--- a/build-templates/wechatgame/cloud_functions/cocos_cloud/index.js
+++ b/build-templates/wechatgame/cloud_functions/cocos_cloud/index.js
@@ -48,6 +48,53 @@ exports.main = async (event, context) => {
         msg: `Save fail, ${JSON.stringify(saveDataRes)}`
       };
     }
+  } else if (cmd === "sync") {
+    // 双向同步：比较客户端与云端时间戳，新的一方覆盖另一方
+    let clientData = event.data || {};
+    let user = await getOrCreaterUser(db, wxContext.OPENID);
+    if (!user) {
+      return { code: -1, msg: "Get or create user fail" };
+    }
+
+    let cloudData = user.game_data || {};
+    let clientTs = clientData.timestamp || 0;
+    let cloudTs = cloudData.timestamp || 0;
+
+    if (clientTs > cloudTs) {
+      // 客户端较新：写入云端
+      let saveDataRes = await db.collection(user_db_name).doc(user._id).update({
+        data: {
+          game_data: _.set(clientData)
+        }
+      });
+      console.log("Sync: client newer, saved to cloud:", saveDataRes, clientData);
+      if (saveDataRes?.stats?.updated >= 1) {
+        return {
+          code: 200,
+          updated: true, // 云端已被客户端数据覆盖
+          data: {
+            openid: wxContext.OPENID,
+            game_data: clientData
+          }
+        };
+      } else {
+        return {
+          code: -1,
+          msg: `Sync save fail, ${JSON.stringify(saveDataRes)}`
+        };
+      }
+    } else {
+      // 云端较新或一致：下发云端数据
+      console.log("Sync: cloud newer, return cloud data");
+      return {
+        code: 200,
+        updated: false, // 客户端应使用云端数据
+        data: {
+          openid: wxContext.OPENID,
+          game_data: cloudData
+        }
+      };
+    }
   }
 
   return {