diff --git a/services/distributedhardwarefwkservice/src/componentmanager/component_manager.cpp b/services/distributedhardwarefwkservice/src/componentmanager/component_manager.cpp
index 1f6bf903dbd9beb1ac3b3828adc5609105e0b883..a705dbdd3c9539a9b3a06cbe6060e4562b7dbdf2 100644
--- a/services/distributedhardwarefwkservice/src/componentmanager/component_manager.cpp
+++ b/services/distributedhardwarefwkservice/src/componentmanager/component_manager.cpp
@@ -843,6 +843,10 @@ int32_t ComponentManager::CheckDemandStart(const std::string &uuid, const DHType
     }
 
     auto iterLocal = dhVersion.compVersions.find(dhType);
+    if (iterLocal == dhVersion.compVersions.end()) {
+        DHLOGE("Not find dhType in local: %{public}#X!", dhType);
+        return ERR_DH_FWK_TYPE_NOT_EXIST;
+    }
     // Check local config
     if (!iterLocal->second.haveFeature) {
         enableSource = true;
diff --git a/services/distributedhardwarefwkservice/src/resourcemanager/capability_info_manager.cpp b/services/distributedhardwarefwkservice/src/resourcemanager/capability_info_manager.cpp
index 057d5e545c0507fa5cee5dca271b4f2e5b08fe1b..c8591f764c06251b5e74a5c329ff47bf856086ce 100644
--- a/services/distributedhardwarefwkservice/src/resourcemanager/capability_info_manager.cpp
+++ b/services/distributedhardwarefwkservice/src/resourcemanager/capability_info_manager.cpp
@@ -61,6 +61,10 @@ CapabilityInfoManager::CapabilityInfoManagerEventHandler::CapabilityInfoManagerE
 void CapabilityInfoManager::CapabilityInfoManagerEventHandler::ProcessEvent(
     const AppExecFwk::InnerEvent::Pointer &event)
 {
+    if (event == nullptr) {
+        DHLOGE("event is null.");
+        return;
+    }
     uint32_t eventId = event->GetInnerEventId();
     auto selfPtr = capabilityInfoMgrWPtr_.lock();
     if (!selfPtr) {
diff --git a/services/distributedhardwarefwkservice/src/resourcemanager/meta_info_manager.cpp b/services/distributedhardwarefwkservice/src/resourcemanager/meta_info_manager.cpp
index 9c373c070ac6330300d76a474114527e42afa2cf..7f46f0b1e37b641abb56c943ccc8d2ed12c27084 100644
--- a/services/distributedhardwarefwkservice/src/resourcemanager/meta_info_manager.cpp
+++ b/services/distributedhardwarefwkservice/src/resourcemanager/meta_info_manager.cpp
@@ -58,6 +58,10 @@ MetaInfoManager::MetaInfoManagerEventHandler::MetaInfoManagerEventHandler(
 
 void MetaInfoManager::MetaInfoManagerEventHandler::ProcessEvent(const AppExecFwk::InnerEvent::Pointer &event)
 {
+    if (event == nullptr) {
+        DHLOGE("event is null.");
+        return;
+    }
     uint32_t eventId = event->GetInnerEventId();
     auto selfPtr = metaInfoMgrWPtr_.lock();
     if (!selfPtr) {
diff --git a/services/distributedhardwarefwkservice/src/resourcemanager/version_info_manager.cpp b/services/distributedhardwarefwkservice/src/resourcemanager/version_info_manager.cpp
index 6d23615565e3caf78d61cb946abef95b49e6bf49..b4dfeb61b7720caf019d2eec5ee5ce7bc9dfd0e8 100644
--- a/services/distributedhardwarefwkservice/src/resourcemanager/version_info_manager.cpp
+++ b/services/distributedhardwarefwkservice/src/resourcemanager/version_info_manager.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022-2024 Huawei Device Co., Ltd.
+ * Copyright (c) 2022-2025 Huawei Device Co., Ltd.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
@@ -49,6 +49,10 @@ VersionInfoManager::VersionInfoManagerEventHandler::VersionInfoManagerEventHandl
 
 void VersionInfoManager::VersionInfoManagerEventHandler::ProcessEvent(const AppExecFwk::InnerEvent::Pointer &event)
 {
+    if (event == nullptr) {
+        DHLOGE("event is null.");
+        return;
+    }
     uint32_t eventId = event->GetInnerEventId();
     auto selfPtr = versionInfoMgrWPtr_.lock();
     if (!selfPtr) {
diff --git a/services/distributedhardwarefwkservice/src/transport/dh_comm_tool.cpp b/services/distributedhardwarefwkservice/src/transport/dh_comm_tool.cpp
index 07cabce942ee363aead2bb4abfab0df3cdc361c2..5d1fbde407fcbbb2fff0c197f134f8948a07a6f8 100644
--- a/services/distributedhardwarefwkservice/src/transport/dh_comm_tool.cpp
+++ b/services/distributedhardwarefwkservice/src/transport/dh_comm_tool.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2024 Huawei Device Co., Ltd.
+ * Copyright (c) 2024-2025 Huawei Device Co., Ltd.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
@@ -159,6 +159,10 @@ DHCommTool::DHCommToolEventHandler::DHCommToolEventHandler(const std::shared_ptr
 void DHCommTool::DHCommToolEventHandler::ProcessEvent(
     const AppExecFwk::InnerEvent::Pointer &event)
 {
+    if (event == nullptr) {
+        DHLOGE("event is null.");
+        return;
+    }
     uint32_t eventId = event->GetInnerEventId();
     std::shared_ptr<CommMsg> commMsg = event->GetSharedObject<CommMsg>();
     if (commMsg == nullptr) {
@@ -200,6 +204,14 @@ void DHCommTool::DHCommToolEventHandler::ProcessFullCapsRsp(const FullCapsRsp &c
         DHLOGE("Receive remote caps info invalid!");
         return;
     }
+    if (dhCommToolPtr == nullptr) {
+        DHLOGE("dhCommToolPtr is null");
+        return;
+    }
+    if (dhCommToolPtr->GetDHTransportPtr() == nullptr) {
+        DHLOGE("Can not get Transport ptr");
+        return;
+    }
     // after receive rsp, close dsoftbus channel
     DHLOGI("we receive full remote capabilities, close channel, remote networkId: %{public}s",
         GetAnonyString(capsRsp.networkId).c_str());
diff --git a/services/distributedhardwarefwkservice/src/transport/dh_transport.cpp b/services/distributedhardwarefwkservice/src/transport/dh_transport.cpp
index c4f9036394ca8cafed8c20e002e95bc249d89bdb..6cc4ac137e1a17e3c414c492d8ce84258a99ebfe 100644
--- a/services/distributedhardwarefwkservice/src/transport/dh_transport.cpp
+++ b/services/distributedhardwarefwkservice/src/transport/dh_transport.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2024 Huawei Device Co., Ltd.
+ * Copyright (c) 2024-2025 Huawei Device Co., Ltd.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
@@ -159,6 +159,10 @@ void OnBind(int32_t socket, PeerSocketInfo info)
         DHLOGE("Can not get DHCommTool ptr");
         return;
     }
+    if (dhCommToolSPtr->GetDHTransportPtr() == nullptr) {
+        DHLOGE("Can not get Transport ptr");
+        return;
+    }
     dhCommToolSPtr->GetDHTransportPtr()->OnSocketOpened(socket, info);
 }
 
@@ -169,6 +173,10 @@ void OnShutdown(int32_t socket, ShutdownReason reason)
         DHLOGE("Can not get DHCommTool ptr");
         return;
     }
+    if (dhCommToolSPtr->GetDHTransportPtr() == nullptr) {
+        DHLOGE("Can not get Transport ptr");
+        return;
+    }
     dhCommToolSPtr->GetDHTransportPtr()->OnSocketClosed(socket, reason);
 }
 
@@ -179,6 +187,10 @@ void OnBytes(int32_t socket, const void *data, uint32_t dataLen)
         DHLOGE("Can not get DHCommTool ptr");
         return;
     }
+    if (dhCommToolSPtr->GetDHTransportPtr() == nullptr) {
+        DHLOGE("Can not get Transport ptr");
+        return;
+    }
     dhCommToolSPtr->GetDHTransportPtr()->OnBytesReceived(socket, data, dataLen);
 }