diff --git a/common_components/base/tests/c_string_test.cpp b/common_components/base/tests/c_string_test.cpp
index 56b0436ac55873a17bfd6cd19d706b945a9fa16b..88b998aac0e39cfce06773682ff1222298b7c74e 100755
--- a/common_components/base/tests/c_string_test.cpp
+++ b/common_components/base/tests/c_string_test.cpp
@@ -274,4 +274,14 @@ HWTEST_F_L0(CStringTest, ConstructTest)
     EXPECT_EQ(nonEmptyStr.Length(), static_cast<size_t>(0));
     EXPECT_EQ(nonEmptyStr.Str()[0], '\0');
 }
+
+HWTEST_F_L0(CStringTest, CStringSubscriptOperatorTest)
+{
+    const CString constStr("hello world");
+    EXPECT_EQ(constStr[0], 'h');
+
+    CString mutableStr("mutable");
+    mutableStr[0] = 'M';
+    EXPECT_EQ(mutableStr[0], 'M');
+}
 }
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