diff --git a/src/virtual_runtime.cpp b/src/virtual_runtime.cpp
index 6dbdf836519062b3fedec09c5d342610c8bb0431..acb054f55e908ef280bfe9d3f471b64105a55663 100644
--- a/src/virtual_runtime.cpp
+++ b/src/virtual_runtime.cpp
@@ -64,6 +64,9 @@ std::string VirtualRuntime::ReadFromSavedCmdLines(pid_t tid)
     std::string line;
     std::string threadid = std::to_string(tid);
     while (getline(savedCmdLines_, line)) {
+#ifdef TEST_LINE_NULL
+        line = "";
+#endif
         if (line.find(threadid) != std::string::npos) {
             constexpr size_t sizeLimit {2};
             std::vector<std::string> linesToken = StringSplit(line, " ");
diff --git a/test/unittest/common/native/virtual_runtime_test.cpp b/test/unittest/common/native/virtual_runtime_test.cpp
index 9eec14de35091522eb1b92ae7708a29eb19ffbf7..f5a58847d58c0bf8ec6608be7b5651f68b3b04ae 100644
--- a/test/unittest/common/native/virtual_runtime_test.cpp
+++ b/test/unittest/common/native/virtual_runtime_test.cpp
@@ -398,6 +398,54 @@ HWTEST_F(VirtualRuntimeTest, Update, TestSize.Level1)
     runtime_->UpdateServiceSymbols();
     runtime_->UpdateDevhostSymbols();
 }
+
+/**
+ * @tc.name: ReadFromSavedCmdLines
+ * @tc.desc: Test ReadFromSavedCmdLines fun
+ * @tc.type: FUNC
+ */
+HWTEST_F(VirtualRuntimeTest, ReadFromSavedCmdLines_line_null, TestSize.Level1)
+{
+    std::string testProcesses = "com.ohos.sceneboard";
+    if (!CheckTestApp(testProcesses)) {
+        testProcesses = "com.ohos.launcher";
+    }
+    FILE *fp = nullptr;
+    char buf[128] = {0}; // 128: buf size
+    std::string cmd = "pidof " + testProcesses;
+    fp = popen(cmd.c_str(), "r");
+    ASSERT_EQ(fp != nullptr, true);
+    if (fgets(buf, sizeof(buf), fp) != nullptr) {
+#define TEST_LINE_NULL
+        std::string res = runtime_->ReadFromSavedCmdLines(std::stoi(buf));
+        printf("res: %s", res.c_str());
+    }
+    pclose(fp);
+}
+
+/**
+ * @tc.name: ReadFromSavedCmdLines
+ * @tc.desc: Test ReadFromSavedCmdLines fun
+ * @tc.type: FUNC
+ */
+HWTEST_F(VirtualRuntimeTest, ReadFromSavedCmdLines_threadid, TestSize.Level1)
+{
+    std::string testProcesses = "com.ohos.sceneboard";
+    if (!CheckTestApp(testProcesses)) {
+        testProcesses = "com.ohos.launcher";
+    }
+    FILE *fp = nullptr;
+    char buf[128] = {0}; // 128: buf size
+    std::string cmd = "pidof " + testProcesses;
+    fp = popen(cmd.c_str(), "r");
+    ASSERT_EQ(fp != nullptr, true);
+    if (fgets(buf, sizeof(buf), fp) != nullptr) {
+#define TEST_THREADID
+        std::string res = runtime_->ReadFromSavedCmdLines(std::stoi(buf));
+        printf("res: %s", res.c_str());
+    }
+    pclose(fp);
+}
 } // namespace HiPerf
 } // namespace Developtools
 } // namespace OHOS