diff --git a/frameworks/libs/distributeddb/syncer/src/cloud/cloud_db_proxy.cpp b/frameworks/libs/distributeddb/syncer/src/cloud/cloud_db_proxy.cpp
index 7e4ac918c5a3b56fcf0fea3cd184df6a9ccfebc0..f0be69e0726ecabe7c7e949869e65bf2423a937c 100644
--- a/frameworks/libs/distributeddb/syncer/src/cloud/cloud_db_proxy.cpp
+++ b/frameworks/libs/distributeddb/syncer/src/cloud/cloud_db_proxy.cpp
@@ -37,6 +37,12 @@ void CloudDBProxy::SetIAssetLoader(const std::shared_ptr<IAssetLoader> &loader)
     iAssetLoader_ = loader;
 }
 
+bool CloudDBProxy::IsNotExistAssetLoader() const
+{
+    std::unique_lock<std::shared_mutex> writeLock(assetLoaderMutex_);
+    return iAssetLoader_ == nullptr;
+}
+
 int CloudDBProxy::BatchInsert(const std::string &tableName, std::vector<VBucket> &record,
     std::vector<VBucket> &extend, Info &uploadInfo)
 {
diff --git a/frameworks/libs/distributeddb/syncer/src/cloud/cloud_db_proxy.h b/frameworks/libs/distributeddb/syncer/src/cloud/cloud_db_proxy.h
index 4173ba104ec5417655de9f1e257d7022fff4d4d8..e5508b5dad7e0aeaca5b8df4c8ea123a755bff58 100644
--- a/frameworks/libs/distributeddb/syncer/src/cloud/cloud_db_proxy.h
+++ b/frameworks/libs/distributeddb/syncer/src/cloud/cloud_db_proxy.h
@@ -53,6 +53,8 @@ public:
 
     bool IsNotExistCloudDB() const;
 
+    bool IsNotExistAssetLoader() const;
+
     int Download(const std::string &tableName, const std::string &gid, const Type &prefix,
         std::map<std::string, Assets> &assets);
 
diff --git a/frameworks/libs/distributeddb/syncer/src/cloud/cloud_syncer.cpp b/frameworks/libs/distributeddb/syncer/src/cloud/cloud_syncer.cpp
index 58665b97e3dbb1228f1f6acee57c5e5e8b0217d6..dada733c64a0540a6438dee75ec45ebb7e5eb308 100644
--- a/frameworks/libs/distributeddb/syncer/src/cloud/cloud_syncer.cpp
+++ b/frameworks/libs/distributeddb/syncer/src/cloud/cloud_syncer.cpp
@@ -58,6 +58,9 @@ int CloudSyncer::Sync(const std::vector<DeviceID> &devices, SyncMode mode,
     if (cloudDB_.IsNotExistCloudDB()) {
         return -E_CLOUD_ERROR;
     }
+    if (cloudDB_.IsNotExistAssetLoader()) {
+        return -E_NOT_SET;
+    }
     if (closed_) {
         return -E_DB_CLOSED;
     }
diff --git a/frameworks/libs/distributeddb/test/unittest/common/syncer/cloud/distributeddb_cloud_db_proxy_test.cpp b/frameworks/libs/distributeddb/test/unittest/common/syncer/cloud/distributeddb_cloud_db_proxy_test.cpp
index 911725dbb65f58a6efadb2a7ae90453588cfca58..d8c70936717dcfe860e7a17f78a9bf35b0433010 100644
--- a/frameworks/libs/distributeddb/test/unittest/common/syncer/cloud/distributeddb_cloud_db_proxy_test.cpp
+++ b/frameworks/libs/distributeddb/test/unittest/common/syncer/cloud/distributeddb_cloud_db_proxy_test.cpp
@@ -21,6 +21,7 @@
 #include "cloud_db_proxy.h"
 #include "distributeddb_tools_unit_test.h"
 #include "mock_icloud_sync_storage_interface.h"
+#include "virtual_asset_loader.h"
 #include "virtual_cloud_db.h"
 #include "virtual_cloud_syncer.h"
 
@@ -112,6 +113,7 @@ public:
 
 protected:
     std::shared_ptr<VirtualCloudDb> virtualCloudDb_ = nullptr;
+    std::shared_ptr<VirtualAssetLoader> virtualAssetLoader_ = nullptr;
 };
 
 void DistributedDBCloudDBProxyTest::SetUpTestCase()
@@ -126,6 +128,7 @@ void DistributedDBCloudDBProxyTest::SetUp()
 {
     DistributedDBUnitTest::DistributedDBToolsUnitTest::PrintTestCaseInfo();
     virtualCloudDb_ = std::make_shared<VirtualCloudDb>();
+    virtualAssetLoader_ = std::make_shared<VirtualAssetLoader>();
 }
 
 void DistributedDBCloudDBProxyTest::TearDown()
@@ -292,6 +295,7 @@ HWTEST_F(DistributedDBCloudDBProxyTest, CloudDBProxyTest004, TestSize.Level3)
     EXPECT_CALL(*iCloud, Commit).WillRepeatedly(testing::Return(E_OK));
     ASSERT_NE(cloudSyncer, nullptr);
     ASSERT_EQ(cloudSyncer->SetCloudDB(virtualCloudDb_), E_OK);
+    ASSERT_EQ(cloudSyncer->SetIAssetLoader(virtualAssetLoader_), E_OK);
     cloudSyncer->SetSyncAction(true, false);
     cloudSyncer->SetDownloadFunc([]() {
         std::this_thread::sleep_for(std::chrono::seconds(5)); // sleep 5s
@@ -359,6 +363,7 @@ HWTEST_F(DistributedDBCloudDBProxyTest, CloudDBProxyTest005, TestSize.Level0)
     EXPECT_CALL(*iCloud, Commit).WillRepeatedly(testing::Return(E_OK));
     ASSERT_NE(cloudSyncer, nullptr);
     ASSERT_EQ(cloudSyncer->SetCloudDB(virtualCloudDb_), E_OK);
+    ASSERT_EQ(cloudSyncer->SetIAssetLoader(virtualAssetLoader_), E_OK);
     cloudSyncer->SetSyncAction(false, false);
     virtualCloudDb_->SetCloudError(true);
     /**
@@ -398,6 +403,7 @@ HWTEST_F(DistributedDBCloudDBProxyTest, CloudDBProxyTest006, TestSize.Level3)
     EXPECT_CALL(*iCloud, Rollback).WillRepeatedly(testing::Return(E_OK));
     ASSERT_NE(cloudSyncer, nullptr);
     ASSERT_EQ(cloudSyncer->SetCloudDB(virtualCloudDb_), E_OK);
+    ASSERT_EQ(cloudSyncer->SetIAssetLoader(virtualAssetLoader_), E_OK);
     cloudSyncer->SetSyncAction(true, false);
     cloudSyncer->SetDownloadFunc([cloudSyncer]() {
         std::this_thread::sleep_for(std::chrono::seconds(5)); // sleep 5s
@@ -443,6 +449,7 @@ HWTEST_F(DistributedDBCloudDBProxyTest, CloudDBProxyTest007, TestSize.Level4)
     EXPECT_CALL(*iCloud, Commit).WillRepeatedly(testing::Return(E_OK));
     ASSERT_NE(cloudSyncer, nullptr);
     ASSERT_EQ(cloudSyncer->SetCloudDB(virtualCloudDb_), E_OK);
+    ASSERT_EQ(cloudSyncer->SetIAssetLoader(virtualAssetLoader_), E_OK);
     cloudSyncer->SetSyncAction(false, false);
     /**
      * @tc.steps: step2. call sync and wait sync finish
@@ -501,6 +508,7 @@ HWTEST_F(DistributedDBCloudDBProxyTest, CloudSyncQueue001, TestSize.Level2)
     EXPECT_CALL(*iCloud, Commit).WillRepeatedly(testing::Return(E_OK));
     EXPECT_CALL(*iCloud, StartTransaction).WillRepeatedly(testing::Return(E_OK));
     ASSERT_EQ(cloudSyncer->SetCloudDB(virtualCloudDb_), E_OK);
+    ASSERT_EQ(cloudSyncer->SetIAssetLoader(virtualAssetLoader_), E_OK);
     cloudSyncer->SetSyncAction(true, false);
     cloudSyncer->SetDownloadFunc([cloudSyncer]() {
         EXPECT_EQ(cloudSyncer->GetQueueCount(), 1u);