diff --git a/test/fuzztest/devicediscovery_fuzzer/device_discovery_fuzzer.cpp b/test/fuzztest/devicediscovery_fuzzer/device_discovery_fuzzer.cpp
index b9d78f841fc30f80c71bb5f2ec3f30de82648a6a..7d33b2bc33e5798c37cb2e2ed8bca874ee771fb1 100644
--- a/test/fuzztest/devicediscovery_fuzzer/device_discovery_fuzzer.cpp
+++ b/test/fuzztest/devicediscovery_fuzzer/device_discovery_fuzzer.cpp
@@ -16,6 +16,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <string>
+#include <unistd.h>
 
 #include "device_manager_impl.h"
 #include "device_manager.h"
@@ -24,6 +25,10 @@
 
 namespace OHOS {
 namespace DistributedHardware {
+namespace {
+    constexpr uint32_t SLEEP_TIME_US = 10 * 1000;
+}
+
 class DeviceDiscoveryCallbackTest : public DiscoveryCallback {
 public:
     DeviceDiscoveryCallbackTest() : DiscoveryCallback() {}
@@ -56,6 +61,7 @@ void DeviceDiscoveryFuzzTest(const uint8_t* data, size_t size)
     std::shared_ptr<DiscoveryCallback> callback = std::make_shared<DeviceDiscoveryCallbackTest>();
     int32_t ret = DeviceManager::GetInstance().StartDeviceDiscovery(bundleName,
         subInfo, extra, callback);
+    usleep(SLEEP_TIME_US);
     ret = DeviceManager::GetInstance().StopDeviceDiscovery(bundleName, subscribeId);
 }
 }
diff --git a/test/fuzztest/devicediscovery_fuzzer/project.xml b/test/fuzztest/devicediscovery_fuzzer/project.xml
index 74691a05224f9dd70066b17268a9219939e181d4..abdc75334c034fcd36b0046bdb15677e91dd575e 100644
--- a/test/fuzztest/devicediscovery_fuzzer/project.xml
+++ b/test/fuzztest/devicediscovery_fuzzer/project.xml
@@ -20,6 +20,6 @@
     <!-- maximum total time in seconds to run the fuzzer -->
     <max_total_time>300</max_total_time>
     <!-- memory usage limit in Mb -->
-    <rss_limit_mb>6144</rss_limit_mb>
+    <rss_limit_mb>8192</rss_limit_mb>
   </fuzztest>
 </fuzz_config>
diff --git a/test/fuzztest/registerdevicemanagerfacallback_fuzzer/project.xml b/test/fuzztest/registerdevicemanagerfacallback_fuzzer/project.xml
index 40fa06afc64beeb9294072d32dc8ecdef8d4400a..36c1a6f1c8171d8b9ee4f87d3d460434c8dccfa0 100644
--- a/test/fuzztest/registerdevicemanagerfacallback_fuzzer/project.xml
+++ b/test/fuzztest/registerdevicemanagerfacallback_fuzzer/project.xml
@@ -20,6 +20,6 @@
     <!-- maximum total time in seconds to run the fuzzer -->
     <max_total_time>300</max_total_time>
     <!-- memory usage limit in Mb -->
-    <rss_limit_mb>6144</rss_limit_mb>
+    <rss_limit_mb>8192</rss_limit_mb>
   </fuzztest>
 </fuzz_config>
\ No newline at end of file
diff --git a/test/fuzztest/registerdevicemanagerfacallback_fuzzer/register_device_manager_fa_callback_fuzzer.cpp b/test/fuzztest/registerdevicemanagerfacallback_fuzzer/register_device_manager_fa_callback_fuzzer.cpp
index 0aa8fe4dbe1223e12a30ad3863cb8c567f6bd6f0..a0323c8f0a4af12f07d07c252686d1426926acb1 100644
--- a/test/fuzztest/registerdevicemanagerfacallback_fuzzer/register_device_manager_fa_callback_fuzzer.cpp
+++ b/test/fuzztest/registerdevicemanagerfacallback_fuzzer/register_device_manager_fa_callback_fuzzer.cpp
@@ -16,6 +16,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <string>
+#include <unistd.h>
 
 #include "device_manager_impl.h"
 #include "device_manager.h"
@@ -24,6 +25,10 @@
 
 namespace OHOS {
 namespace DistributedHardware {
+namespace {
+    constexpr uint32_t SLEEP_TIME_US = 10 * 1000;
+}
+
 class DeviceManagerFaCallbackTest : public DeviceManagerFaCallback {
 public:
     DeviceManagerFaCallbackTest() : DeviceManagerFaCallback() {}
@@ -42,6 +47,7 @@ void RegisterDeviceManagerFaCallbackFuzzTest(const uint8_t* data, size_t size)
     std::shared_ptr<DeviceManagerFaCallbackTest> callback = std::make_shared<DeviceManagerFaCallbackTest>();
 
     DeviceManager::GetInstance().RegisterDeviceManagerFaCallback(packageName, callback);
+    usleep(SLEEP_TIME_US);
 }
 }
 }