diff --git a/services/flashd/daemon/commander.cpp b/services/flashd/daemon/commander.cpp
index d1be95eb3e40677a8707ccb28082f04fdd3328d7..9cd2cc9ce03bb029d85bee56d77c276b94f45984 100644
--- a/services/flashd/daemon/commander.cpp
+++ b/services/flashd/daemon/commander.cpp
@@ -37,6 +37,7 @@ void Commander::NotifyFail(CmdType type, const std::string &msg) const
 
 void Commander::UpdateProgress(CmdType type) const
 {
+#ifndef UPDATER_UT
     if (!IsCallbackVaild()) {
         return;
     }
@@ -56,6 +57,7 @@ void Commander::UpdateProgress(CmdType type) const
     }
     preProcess = currentProcess;
     callback_(type, UpdaterState::DOING, std::to_string(currentProcess));
+#endif
 }
 
 bool Commander::IsCallbackVaild() const
diff --git a/services/flashd/daemon/system_depend.cpp b/services/flashd/daemon/system_depend.cpp
index c8d702ec1b2d296530235a9cfffc66ef29388123..6adf39d165bb749a950f3a6160b5506337c54494 100644
--- a/services/flashd/daemon/system_depend.cpp
+++ b/services/flashd/daemon/system_depend.cpp
@@ -32,6 +32,7 @@ envirments
 
 namespace Hdc {
 namespace SystemDepend {
+#ifndef UPDATER_UT
     bool SetDevItem(const char *key, const char *value)
     {
         bool ret = true;
@@ -57,5 +58,6 @@ namespace SystemDepend {
         Updater::Utils::UpdaterDoReboot("", "Updater flashd reboot command");
         return true;
     }
+#endif
 }
 }  // namespace Hdc
diff --git a/services/flashd/daemon/update_commander.cpp b/services/flashd/daemon/update_commander.cpp
index d8735711b956fd912d170f0d0e18f8f77c48b4d8..c76721cc87a1f526640b156bede4f49157842325 100644
--- a/services/flashd/daemon/update_commander.cpp
+++ b/services/flashd/daemon/update_commander.cpp
@@ -88,7 +88,7 @@ bool UpdateCommander::DoUpdate(const uint8_t *payload, int payloadSize)
         FLASHD_LOGE("file fd is invaild");
         return false;
     }
-
+#ifndef UPDATER_UT
     auto writeSize = std::min(static_cast<size_t>(payloadSize), fileSize_ - currentSize_);
     if (writeSize <= 0) {
         FLASHD_LOGW("all the data has been written");
@@ -109,6 +109,7 @@ bool UpdateCommander::DoUpdate(const uint8_t *payload, int payloadSize)
         NotifySuccess(CmdType::UPDATE);
         return true;
     }
+#endif
     UpdateProgress(CmdType::UPDATE);
     return true;
 }
@@ -118,9 +119,11 @@ bool UpdateCommander::ExecUpdate() const
     const std::string miscFile = "/dev/block/by-name/misc";
     std::vector<std::string> filePath;
     filePath.push_back(filePath_);
+#ifndef UPDATER_UT
     if (RebootAndInstallUpgradePackage(miscFile, filePath) == 0) {
         return true;
     }
+#endif
     return false;
 }
 
diff --git a/services/flashd/partition.h b/services/flashd/partition.h
index d693d1db840d403d46c894d38ab70dca1477c18a..5bf3c8a653014e452380cbbdaca54935cd433fb0 100644
--- a/services/flashd/partition.h
+++ b/services/flashd/partition.h
@@ -38,9 +38,13 @@ public:
     int DoEraseExt(const Ptable::PtnInfo &ptnInfo) const;
 #endif
 
+#ifdef UPDATER_UT
+    uint64_t GetBlockDeviceSize(int fd) const;
+#else
 private:
     uint64_t GetBlockDeviceSize(int fd) const;
-
+#endif
+private:
     std::string devName_ = "";
     std::unique_ptr<FlashdWriter> writer_ = nullptr;
 };
diff --git a/test/unittest/flashd_test/flashd_unittest.cpp b/test/unittest/flashd_test/flashd_unittest.cpp
index b1111095ac3bfc3c35a8182d788d1549364b48bd..d8023bf10eda303608a5fc1956dc48fafd2302d9 100644
--- a/test/unittest/flashd_test/flashd_unittest.cpp
+++ b/test/unittest/flashd_test/flashd_unittest.cpp
@@ -235,6 +235,45 @@ HWTEST_F(FLashServiceUnitTest, FlashdWriterRawWriter, TestSize.Level1)
     EXPECT_EQ(-1, ret);
 }
 
+HWTEST_F(FLashServiceUnitTest, RegisterUserWriter, TestSize.Level0)
+{
+    std::string partName = "";
+    std::string temp = "";
+    uint8_t *buffer = reinterpret_cast<uint8_t*>(temp.data());
+    int bufferSize = partName.size();
+    std::unique_ptr<FlashdWriter> writer = FlashdImageWriter::GetInstance().GetWriter(partName, buffer, bufferSize);
+    if (writer == nullptr) {
+        std::cout << "writer is nullptr";
+    }
+    EXPECT_NE(nullptr, writer);
+    LOG(INFO) << "RegisterUserWriter finish";
+}
+
+HWTEST_F(FLashServiceUnitTest, UpdateCommanderPostCommand, TestSize.Level0)
+{
+    LoadFstab();
+    std::unique_ptr<Flashd::Commander> commander = nullptr;
+    Flashd::UpdaterState ret = UpdaterState::DOING;
+    auto callbackFail = [&ret](Flashd::CmdType type, Flashd::UpdaterState state, const std::string &msg) {
+        ret = state;
+    };
+    commander = Flashd::CommanderFactory::GetInstance().CreateCommander(Hdc::CMDSTR_UPDATE_SYSTEM, callbackFail);
+    EXPECT_NE(nullptr, commander);
+    commander->PostCommand();
+    EXPECT_NE(nullptr, commander);
+    LOG(INFO) << "UpdateCommanderPostCommand finish";
+}
+
+HWTEST_F(FLashServiceUnitTest, PartitionGetBlockDeviceSize, TestSize.Level1)
+{
+    std::string partitionName = "test";
+    Partition partTest(partitionName);
+    int fd = 1;
+    int ret = partTest.GetBlockDeviceSize(fd);
+    LOG(INFO) << "PartitionGetBlockDeviceSize ret: " << ret;
+    EXPECT_EQ(0, ret);
+}
+
 bool IsTestImg(const std::string &partition, const uint8_t *data, size_t len)
 {
     if (data == nullptr) {