diff --git a/source/module_base/test/CMakeLists.txt b/source/module_base/test/CMakeLists.txt
index 16f0d21f14..d500a6d97a 100644
--- a/source/module_base/test/CMakeLists.txt
+++ b/source/module_base/test/CMakeLists.txt
@@ -127,3 +127,8 @@ AddTest(
   TARGET base_opt_TN
   SOURCES opt_TN_test.cpp opt_test_tools.cpp ../opt_CG.cpp ../opt_DCsrch.cpp ../global_variable.cpp ../../src_parallel/parallel_reduce.cpp
 )
+
+AddTest(
+  TARGET base_ylm
+  SOURCES ylm_test.cpp  ../ylm.cpp  ../timer.cpp  ../tool_quit.cpp ../global_variable.cpp ../global_file.cpp ../memory.cpp
+  )
diff --git a/source/module_base/test/ylm_test.cpp b/source/module_base/test/ylm_test.cpp
new file mode 100644
index 0000000000..ee85ac80ec
--- /dev/null
+++ b/source/module_base/test/ylm_test.cpp
@@ -0,0 +1,25 @@
+#include "../ylm.h"
+#include "gtest/gtest.h"
+/************************************************
+ *  unit test of class ylm
+ ***********************************************/
+
+/**
+ * - Tested Functions:
+ *   - ZEROS
+ *     - set all elements of a double float array to zero
+ * */
+
+class ylmTest : public testing::Test
+{
+};
+
+TEST_F(ylmTest,Zeros)
+{
+    double aaaa[100];
+    ModuleBase::Ylm::ZEROS(aaaa,100); 
+    for(int i = 0; i < 100; i++)
+	{
+        EXPECT_EQ(aaaa[i],0.0);
+	}
+}