diff --git a/utils/src/dinput_utils_tool.cpp b/utils/src/dinput_utils_tool.cpp
index 6bf0655c93727a850ef0e2fa45c748a4a95a2444..f7136a4d57b51a28e500048b77b1424a0d454dd4 100644
--- a/utils/src/dinput_utils_tool.cpp
+++ b/utils/src/dinput_utils_tool.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022-2023 Huawei Device Co., Ltd.
+ * Copyright (c) 2022-2024 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
@@ -450,7 +450,7 @@ int32_t GetRandomInt32()
 
 std::string JointDhIds(const std::vector<std::string> &dhids)
 {
-    if (dhids.size() <= 0) {
+    if (dhids.size() == 0) {
         return "";
     }
     auto dotFold = [](std::string a, std::string b) {return std::move(a) + DHID_SPLIT + std::move(b);};
diff --git a/utils/test/unittest/dinput_context_test.cpp b/utils/test/unittest/dinput_context_test.cpp
index 7c541d691cf2385dda698fee863ac3b071fb1368..7b3211d438f4f2f69f0d5e97c0b714fefd0beb39 100644
--- a/utils/test/unittest/dinput_context_test.cpp
+++ b/utils/test/unittest/dinput_context_test.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022 Huawei Device Co., Ltd.
+ * Copyright (c) 2022-2024 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
@@ -239,6 +239,13 @@ HWTEST_F(DInputContextTest, GetNodeDesc_001, testing::ext::TestSize.Level1)
     EXPECT_EQ(0, ret.size());
 }
 
+HWTEST_F(DInputContextTest, JointDhIds_001, testing::ext::TestSize.Level1)
+{
+    std::vector<std::string> dhids;
+    std::string ret = JointDhIds(dhids);
+    EXPECT_EQ("", ret);
+}
+
 } // namespace DistributedInput
 } // namespace DistributedHardware
 } // namespace OHOS