diff --git a/frameworks/native/appkit/ability_bundle_manager_helper/bundle_mgr_helper.cpp b/frameworks/native/appkit/ability_bundle_manager_helper/bundle_mgr_helper.cpp
index 94c8a8e6dde48e88e30a7a71b00a403e3e690acf..e2c139fe30cd61b6dee57179a0d55250f865ad96 100644
--- a/frameworks/native/appkit/ability_bundle_manager_helper/bundle_mgr_helper.cpp
+++ b/frameworks/native/appkit/ability_bundle_manager_helper/bundle_mgr_helper.cpp
@@ -900,19 +900,6 @@ ErrCode BundleMgrHelper::QueryExtensionAbilityInfosOnlyWithTypeName(const std::s
     return bundleMgr->QueryExtensionAbilityInfosOnlyWithTypeName(extensionTypeName, flag, userId, extensionInfos);
 }
 
-sptr<IDefaultApp> BundleMgrHelper::GetDefaultAppProxy()
-{
-    TAG_LOGD(AAFwkTag::BUNDLEMGRHELPER, "called");
-    auto bundleMgr = Connect();
-    if (bundleMgr == nullptr) {
-        TAG_LOGE(AAFwkTag::BUNDLEMGRHELPER, "null bundleMgr");
-        return nullptr;
-    }
-
-    HITRACE_METER_NAME(HITRACE_TAG_ABILITY_MANAGER, __PRETTY_FUNCTION__);
-    return bundleMgr->GetDefaultAppProxy();
-}
-
 ErrCode BundleMgrHelper::GetJsonProfile(ProfileType profileType, const std::string &bundleName,
     const std::string &moduleName, std::string &profile, int32_t userId)
 {
diff --git a/interfaces/kits/native/appkit/ability_bundle_manager_helper/bundle_mgr_helper.h b/interfaces/kits/native/appkit/ability_bundle_manager_helper/bundle_mgr_helper.h
index 3862786ed6c4f836224d8800ce8b9c26fbaa2b73..1181ca97211a143d2e75ab6deb756a35ab82f449 100644
--- a/interfaces/kits/native/appkit/ability_bundle_manager_helper/bundle_mgr_helper.h
+++ b/interfaces/kits/native/appkit/ability_bundle_manager_helper/bundle_mgr_helper.h
@@ -101,7 +101,6 @@ public:
     ErrCode GetUidByBundleName(const std::string &bundleName, int32_t userId, int32_t appCloneIndex);
     ErrCode QueryExtensionAbilityInfosOnlyWithTypeName(const std::string &extensionTypeName,
         const uint32_t flag, const int32_t userId, std::vector<ExtensionAbilityInfo> &extensionInfos);
-    sptr<IDefaultApp> GetDefaultAppProxy();
     ErrCode GetLaunchWantForBundle(const std::string &bundleName, Want &want, int32_t userId);
     ErrCode QueryCloneAbilityInfo(const ElementName &element, int32_t flags, int32_t appCloneIndex,
         AbilityInfo &abilityInfo, int32_t userId);
diff --git a/services/abilitymgr/include/implicit_start_processor.h b/services/abilitymgr/include/implicit_start_processor.h
index fe0f546095f51dee0365d89446a3f939fb2a73fe..6a0407526d8ab147e3881a6d863e4816ee7b4b45 100644
--- a/services/abilitymgr/include/implicit_start_processor.h
+++ b/services/abilitymgr/include/implicit_start_processor.h
@@ -106,7 +106,6 @@ private:
 
     bool FilterAbilityList(const Want &want, std::vector<AppExecFwk::AbilityInfo> &abilityInfos,
         std::vector<AppExecFwk::ExtensionAbilityInfo> extensionInfos, int32_t userId);
-    sptr<AppExecFwk::IDefaultApp> GetDefaultAppProxy();
 
     void GetEcologicalCallerInfo(const Want &want, ErmsCallerInfo &callerInfo, int32_t userId);
 
diff --git a/services/abilitymgr/src/implicit_start_processor.cpp b/services/abilitymgr/src/implicit_start_processor.cpp
index 9ad8163c34b5700d7a9b8c9f2e96ee6946053d3b..4fad9f6dd188830d8c0182860544390f3b38b0cb 100644
--- a/services/abilitymgr/src/implicit_start_processor.cpp
+++ b/services/abilitymgr/src/implicit_start_processor.cpp
@@ -17,6 +17,7 @@
 #include "ability_manager_service.h"
 #include "ability_util.h"
 #include "app_utils.h"
+#include "default_app_client.h"
 #include "dialog_session_manager.h"
 #include "ecological_rule/ability_ecological_rule_mgr_service.h"
 #include "global_constant.h"
@@ -823,21 +824,6 @@ std::shared_ptr<AppExecFwk::BundleMgrHelper> ImplicitStartProcessor::GetBundleMa
     return iBundleManagerHelper_;
 }
 
-sptr<AppExecFwk::IDefaultApp> ImplicitStartProcessor::GetDefaultAppProxy()
-{
-    auto bundleMgrHelper = GetBundleManagerHelper();
-    if (bundleMgrHelper == nullptr) {
-        TAG_LOGE(AAFwkTag::ABILITYMGR, "null bundleMgrHelper");
-        return nullptr;
-    }
-    auto defaultAppProxy = bundleMgrHelper->GetDefaultAppProxy();
-    if (defaultAppProxy == nullptr) {
-        TAG_LOGE(AAFwkTag::ABILITYMGR, "null defaultAppProxy");
-        return nullptr;
-    }
-    return defaultAppProxy;
-}
-
 bool ImplicitStartProcessor::FilterAbilityList(const Want &want, std::vector<AppExecFwk::AbilityInfo> &abilityInfos,
     std::vector<AppExecFwk::ExtensionAbilityInfo> extensionInfos, int32_t userId)
 {
@@ -973,12 +959,10 @@ void ImplicitStartProcessor::AddAbilityInfoToDialogInfos(const AddInfoParam &par
 
 bool ImplicitStartProcessor::IsExistDefaultApp(int32_t userId, const std::string &typeName)
 {
-    auto defaultMgr = GetDefaultAppProxy();
-    CHECK_POINTER_AND_RETURN_LOG(defaultMgr, false, "defaultMgr null");
     AppExecFwk::BundleInfo bundleInfo;
     TAG_LOGD(AAFwkTag::ABILITYMGR, "userId: %{public}d, typeName: %{public}s", userId, typeName.c_str());
-    ErrCode ret =
-        IN_PROCESS_CALL(defaultMgr->GetDefaultApplication(userId, typeName, bundleInfo));
+    ErrCode ret = IN_PROCESS_CALL(
+        AppExecFwk::DefaultAppClient::GetInstance().GetDefaultApplication(userId, typeName, bundleInfo));
     if (ret != ERR_OK) {
         return false;
     }
diff --git a/test/fuzztest/bundlemgrhelper_fuzzer/bundlemgrhelper_fuzzer.cpp b/test/fuzztest/bundlemgrhelper_fuzzer/bundlemgrhelper_fuzzer.cpp
index a6731b31a3925d34cb6bb0a3527a3e698c8d3eee..c3ab84d991d729f38406b7715ab57003d535309a 100755
--- a/test/fuzztest/bundlemgrhelper_fuzzer/bundlemgrhelper_fuzzer.cpp
+++ b/test/fuzztest/bundlemgrhelper_fuzzer/bundlemgrhelper_fuzzer.cpp
@@ -134,7 +134,6 @@ void BundleMgrHelperFuzztest2(bool boolParam, std::string &stringParam, int32_t
     bmHelper->QueryAppGalleryBundleName(stringParam);
     bmHelper->GetUidByBundleName(stringParam, int32Param, int32Param);
     bmHelper->QueryExtensionAbilityInfosOnlyWithTypeName(stringParam, int32Param, int32Param, extensionInfos);
-    bmHelper->GetDefaultAppProxy();
     bmHelper->GetJsonProfile(static_cast<ProfileType>(int32Param), stringParam, stringParam, stringParam, int32Param);
     bmHelper->GetLaunchWantForBundle(stringParam, want, int32Param);
     ElementName element;
diff --git a/test/unittest/ability_permission_util_second_test/mock/src/mock_bundle_mgr_helper.cpp b/test/unittest/ability_permission_util_second_test/mock/src/mock_bundle_mgr_helper.cpp
index b49f03f696fb1b8240fe062f8cbccfac97a4c42c..8f809aa3b7280eed671aebe5bc1df73678140434 100755
--- a/test/unittest/ability_permission_util_second_test/mock/src/mock_bundle_mgr_helper.cpp
+++ b/test/unittest/ability_permission_util_second_test/mock/src/mock_bundle_mgr_helper.cpp
@@ -307,11 +307,6 @@ ErrCode BundleMgrHelper::QueryExtensionAbilityInfosOnlyWithTypeName(const std::s
     return ERR_OK;
 }
 
-sptr<IDefaultApp> BundleMgrHelper::GetDefaultAppProxy()
-{
-    return nullptr;
-}
-
 ErrCode BundleMgrHelper::GetLaunchWantForBundle(const std::string& bundleName, Want& want, int32_t userId)
 {
     return ERR_OK;
diff --git a/test/unittest/app_mgr_service_fourth_test/mock/include/mock_bundle_mgr_helper.h b/test/unittest/app_mgr_service_fourth_test/mock/include/mock_bundle_mgr_helper.h
index 68693fbcd7d6e32a11ef338cd87f39219bfe2ae3..ff966aa338987083d4d4a1847b431702c6d6f41c 100755
--- a/test/unittest/app_mgr_service_fourth_test/mock/include/mock_bundle_mgr_helper.h
+++ b/test/unittest/app_mgr_service_fourth_test/mock/include/mock_bundle_mgr_helper.h
@@ -95,7 +95,6 @@ public:
     ErrCode GetUidByBundleName(const std::string& bundleName, int32_t userId, int32_t appCloneIndex);
     ErrCode QueryExtensionAbilityInfosOnlyWithTypeName(const std::string& extensionTypeName, const uint32_t flag,
         const int32_t userId, std::vector<ExtensionAbilityInfo>& extensionInfos);
-    sptr<IDefaultApp> GetDefaultAppProxy();
     ErrCode GetLaunchWantForBundle(const std::string& bundleName, Want& want, int32_t userId);
     ErrCode QueryCloneAbilityInfo(
         const ElementName& element, int32_t flags, int32_t appCloneIndex, AbilityInfo& abilityInfo, int32_t userId);
diff --git a/test/unittest/app_mgr_service_inner_eighth_test/mock/src/mock_bundle_mgr_helper.cpp b/test/unittest/app_mgr_service_inner_eighth_test/mock/src/mock_bundle_mgr_helper.cpp
index 817574298de80de1e658e041752c21587e2c3061..62337df0ce060d3af0e2cbd76565637b8b34cf9d 100755
--- a/test/unittest/app_mgr_service_inner_eighth_test/mock/src/mock_bundle_mgr_helper.cpp
+++ b/test/unittest/app_mgr_service_inner_eighth_test/mock/src/mock_bundle_mgr_helper.cpp
@@ -305,11 +305,6 @@ ErrCode BundleMgrHelper::QueryExtensionAbilityInfosOnlyWithTypeName(const std::s
     return ERR_OK;
 }
 
-sptr<IDefaultApp> BundleMgrHelper::GetDefaultAppProxy()
-{
-    return nullptr;
-}
-
 ErrCode BundleMgrHelper::GetLaunchWantForBundle(const std::string& bundleName, Want& want, int32_t userId)
 {
     return ERR_OK;
diff --git a/test/unittest/app_mgr_service_inner_ninth_test/mock/src/mock_bundle_mgr_helper.cpp b/test/unittest/app_mgr_service_inner_ninth_test/mock/src/mock_bundle_mgr_helper.cpp
index 817574298de80de1e658e041752c21587e2c3061..62337df0ce060d3af0e2cbd76565637b8b34cf9d 100644
--- a/test/unittest/app_mgr_service_inner_ninth_test/mock/src/mock_bundle_mgr_helper.cpp
+++ b/test/unittest/app_mgr_service_inner_ninth_test/mock/src/mock_bundle_mgr_helper.cpp
@@ -305,11 +305,6 @@ ErrCode BundleMgrHelper::QueryExtensionAbilityInfosOnlyWithTypeName(const std::s
     return ERR_OK;
 }
 
-sptr<IDefaultApp> BundleMgrHelper::GetDefaultAppProxy()
-{
-    return nullptr;
-}
-
 ErrCode BundleMgrHelper::GetLaunchWantForBundle(const std::string& bundleName, Want& want, int32_t userId)
 {
     return ERR_OK;
diff --git a/test/unittest/app_mgr_service_inner_seventh_test/mock/src/mock_bundle_mgr_helper.cpp b/test/unittest/app_mgr_service_inner_seventh_test/mock/src/mock_bundle_mgr_helper.cpp
index 88fbfdea14d87ce20d537b56ad6b06392a34dcc6..bf2507b34a5d9c7ac326892de3da523af623aa72 100755
--- a/test/unittest/app_mgr_service_inner_seventh_test/mock/src/mock_bundle_mgr_helper.cpp
+++ b/test/unittest/app_mgr_service_inner_seventh_test/mock/src/mock_bundle_mgr_helper.cpp
@@ -303,11 +303,6 @@ ErrCode BundleMgrHelper::QueryExtensionAbilityInfosOnlyWithTypeName(const std::s
     return ERR_OK;
 }
 
-sptr<IDefaultApp> BundleMgrHelper::GetDefaultAppProxy()
-{
-    return nullptr;
-}
-
 ErrCode BundleMgrHelper::GetLaunchWantForBundle(const std::string& bundleName, Want& want, int32_t userId)
 {
     return ERR_OK;
diff --git a/test/unittest/app_mgr_service_inner_sixth_test/mock/include/mock_bundle_mgr_helper.h b/test/unittest/app_mgr_service_inner_sixth_test/mock/include/mock_bundle_mgr_helper.h
index e6862802f30c3093f9b542b163cf9676a2902c7e..46930a2f25184eff97e76df47c24ea00933c2924 100755
--- a/test/unittest/app_mgr_service_inner_sixth_test/mock/include/mock_bundle_mgr_helper.h
+++ b/test/unittest/app_mgr_service_inner_sixth_test/mock/include/mock_bundle_mgr_helper.h
@@ -97,7 +97,6 @@ public:
     ErrCode GetUidByBundleName(const std::string& bundleName, int32_t userId, int32_t appCloneIndex);
     ErrCode QueryExtensionAbilityInfosOnlyWithTypeName(const std::string& extensionTypeName, const uint32_t flag,
         const int32_t userId, std::vector<ExtensionAbilityInfo>& extensionInfos);
-    sptr<IDefaultApp> GetDefaultAppProxy();
     ErrCode GetLaunchWantForBundle(const std::string& bundleName, Want& want, int32_t userId);
     ErrCode QueryCloneAbilityInfo(
         const ElementName& element, int32_t flags, int32_t appCloneIndex, AbilityInfo& abilityInfo, int32_t userId);
diff --git a/test/unittest/bundle_mgr_helper_test/bundle_mgr_helper_test.cpp b/test/unittest/bundle_mgr_helper_test/bundle_mgr_helper_test.cpp
index 7624899366b7e2f1f1c5bc89b700a0e696273706..a674dc5872b37077df8bc954c1f774307d4587c1 100644
--- a/test/unittest/bundle_mgr_helper_test/bundle_mgr_helper_test.cpp
+++ b/test/unittest/bundle_mgr_helper_test/bundle_mgr_helper_test.cpp
@@ -498,17 +498,6 @@ HWTEST_F(BundleMgrHelperTest, BundleMgrHelperTest_QueryAbilityInfo_003, TestSize
     EXPECT_EQ(ret, false);
 }
 
-/**
- * @tc.name: BundleMgrHelperTest_GetDefaultAppProxy_001
- * @tc.desc: GetDefaultAppProxy
- * @tc.type: FUNC
- */
-HWTEST_F(BundleMgrHelperTest, BundleMgrHelperTest_GetDefaultAppProxy_001, TestSize.Level1)
-{
-    auto ret = bundleMgrHelper->GetDefaultAppProxy();
-    EXPECT_NE(ret, nullptr);
-}
-
 #ifdef WITH_DLP
 /**
  * @tc.name: BundleMgrHelperTest_InstallSandboxApp_001
diff --git a/test/unittest/implicit_start_processor_test/implicit_start_processor_test.cpp b/test/unittest/implicit_start_processor_test/implicit_start_processor_test.cpp
index 6cdb8fee6884fd94beb65995404fda6d9c9f5d42..a240b3d1bc390a0a4132f2d6aece86be9b22c717 100644
--- a/test/unittest/implicit_start_processor_test/implicit_start_processor_test.cpp
+++ b/test/unittest/implicit_start_processor_test/implicit_start_processor_test.cpp
@@ -990,21 +990,6 @@ HWTEST_F(ImplicitStartProcessorTest, OnlyKeepReserveApp_005, TestSize.Level1)
     }
 }
 
-/*
- * Feature: ImplicitStartProcessor
- * Function: GetDefaultAppProxy
- * SubFunction: NA
- * FunctionPoints:ImplicitStartProcessor GetDefaultAppProxy
- * EnvConditions: NA
- * CaseDescription: Verify GetDefaultAppProxy  etc.
- */
-HWTEST_F(ImplicitStartProcessorTest, GetDefaultAppProxy_001, TestSize.Level1)
-{
-    auto processor = std::make_shared<ImplicitStartProcessor>();
-    auto result = processor->GetDefaultAppProxy();
-    EXPECT_EQ(result, nullptr);
-}
-
 /*
  * Feature: ImplicitStartProcessor
  * Function: FilterAbilityList