diff --git a/CMakeLists.txt b/CMakeLists.txt
index 53e985ffdcdc7f2bad68e1a9f0d4501ee60d8ff8..dcb42325427f16f4e43bbf737b6ad5ce39b440ea 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -85,8 +85,10 @@ add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/third_party)
 
 add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/src)
 
-# ut and gcoverage
-add_subdirectory(tests)
+# llt and gcoverage
+if (LCR_GCOV)
+    add_subdirectory(tests)
+endif()
 
 # install all files
 install(FILES ${CMAKE_BINARY_DIR}/conf/lcr.pc
diff --git a/cmake/checker.cmake b/cmake/checker.cmake
index 7f8e9ccc03d62a7b7a94f273972f752b8352bc32..20ad917cf7da8f59cb16bcf3a62385824817d292 100644
--- a/cmake/checker.cmake
+++ b/cmake/checker.cmake
@@ -69,7 +69,7 @@ find_library(LIBYAJL_LIBRARY yajl
 	HINTS ${PC_LIBYAJL_LIBDIR} ${PC_LIBYAJL_LIBRARY_DIRS})
 _CHECK(LIBYAJL_LIBRARY "LIBYAJL_LIBRARY-NOTFOUND" "libyajl.so")
 
-if (ENABLE_GCOV)
+if (LCR_GCOV)
     pkg_check_modules(PC_GTEST "gtest")
     find_path(GTEST_INCLUDE_DIR gtest/gtest.h
         HINTS ${PC_GTEST_INCLUDEDIR} ${PC_GTEST_INCLUDE_DIRS})
diff --git a/cmake/set_build_flags.cmake b/cmake/set_build_flags.cmake
index 87cab3ee59521d217a2be4c508cd6686e17c4e21..9aab5e19e6062a5f13e64a8fa66f649caa09f5c0 100644
--- a/cmake/set_build_flags.cmake
+++ b/cmake/set_build_flags.cmake
@@ -29,8 +29,8 @@ set(CMAKE_EXE_LINKER_FLAGS "-Wl,-E -Wl,-z,relro -Wl,-z,now -Wl,-z,noexecstack -W
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__='\"$(subst ${CMAKE_SOURCE_DIR}/,,$(abspath $<))\"'")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__FILENAME__='\"$(subst ${CMAKE_SOURCE_DIR}/,,$(abspath $<))\"'")
 
-option(ENABLE_GCOV "set lcr gcov option" OFF)
-if (ENABLE_GCOV)
+option(LCR_GCOV "set lcr gcov option" OFF)
+if (LCR_GCOV)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -fprofile-arcs -ftest-coverage")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -fprofile-arcs -ftest-coverage")
     SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lgcov")
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 6ed2d955665e89ade37823ce37aa682056935cc5..5e09c93662b0f4b7b1c0ccf6b614b9bf34828ea4 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -103,6 +103,10 @@ if (CMAKE_TOOLCHAIN_FILE)
     target_link_libraries(liblcr ${EXTRAL_LINK_LIBS})
 endif()
 
+if (LCR_GCOV)
+    target_link_libraries(liblcr -lgcov)
+endif()
+
 # install all files
 install(TARGETS liblcr
   LIBRARY DESTINATION ${LIB_INSTALL_DIR_DEFAULT} PERMISSIONS OWNER_READ OWNER_EXECUTE GROUP_READ GROUP_EXECUTE)
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 58a6fad884379c00a02610c693502bb43bce6226..ca6d164df60dbb623dcd05f1174cd71423af89bf 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -61,48 +61,38 @@ endmacro()
 
 # --------------- testcase add here -----------------
 #   api testcase
-_DEFINE_NEW_TEST(log_ut log_testcase)
-_DEFINE_NEW_TEST(libocispec_ut json_testcase)
-
+_DEFINE_NEW_TEST(log_llt log_testcase)
+_DEFINE_NEW_TEST(json_llt json_testcase)
 
 # mock test for run lcov to generate html
-add_executable(mock_ut main.cpp)
-target_include_directories(mock_ut PUBLIC
+add_executable(mock_llt main.cpp)
+target_include_directories(mock_llt PUBLIC
     ${GTEST_INCLUDE_DIR}
     PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}
     )
-target_link_libraries(mock_ut
+target_link_libraries(mock_llt
     gtest
     pthread
     )
-add_dependencies(mock_ut log_ut libocispec_ut)
+add_dependencies(mock_llt log_llt json_llt)
 
-# run ut and gcov
-if (ENABLE_GCOV)
-    set(result isula_libutils.info)
-    set(result_dir lcr_gcovs)
-    set(target_dir src/CMakeFiles/isula_libutils.dir)
+set(result isula_libutils.info)
+set(result_dir lcr_gcovs)
+set(target_dir src/CMakeFiles/isula_libutils.dir)
 
-    add_custom_command(TARGET mock_ut
-        POST_BUILD
-        COMMAND ${CMAKE_COMMAND} -E remove -f ${result}
-        COMMAND ${CMAKE_COMMAND} -E make_directory ${result_dir}
-        COMMAND "ctest"
-        COMMAND ${CMD_LCOV} --gcov-tool ${CMD_GCOV} --exclude "/usr/*" --exclude "*/src/utils.c" --exclude "*/json/*" -d ${CMAKE_BINARY_DIR}/${target_dir} -c -o ${result}
-        COMMAND ${CMD_GENHTML} --ignore-errors source -o ${result_dir} ${result}
-        COMMAND ${CMAKE_COMMAND} -E echo run gcov finish
-        VERBATIM
-        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/tests
-        )
-else()
-    add_custom_command(TARGET mock_ut
-        PRE_BUILD
-        COMMAND "ctest"
-        COMMAND ${CMAKE_COMMAND} -E echo UT finish
-        VERBATIM
-        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/tests
-        )
-endif()
+# generate gcov
+
+add_custom_command(TARGET mock_llt
+    POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E remove -f ${result}
+    COMMAND ${CMAKE_COMMAND} -E make_directory ${result_dir}
+    COMMAND "ctest"
+    COMMAND ${CMD_LCOV} --gcov-tool ${CMD_GCOV} --exclude "/usr/*" --exclude "*/src/utils.c" --exclude "*/json/*" -d ${CMAKE_BINARY_DIR}/${target_dir} -c -o ${result}
+    COMMAND ${CMD_GENHTML} --ignore-errors source -o ${result_dir} ${result}
+    COMMAND ${CMAKE_COMMAND} -E echo LLT finish
+    VERBATIM
+    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/tests
+    )
 
 # --------------- testcase add finish -----------------
 
diff --git a/tests/libocispec_ut.cpp b/tests/json_llt.cpp
similarity index 97%
rename from tests/libocispec_ut.cpp
rename to tests/json_llt.cpp
index 58a1f52866e7a34949e77aed8fbfe5d519efe7dd..9622ed4788424d38bf5a9c9a2a27b5cacc7ff1fd 100644
--- a/tests/libocispec_ut.cpp
+++ b/tests/json_llt.cpp
@@ -30,7 +30,7 @@
 #include "read_file.h"
 #include "oci_runtime_hooks.h"
 
-TEST(libocispec_testcase, test_oci_runtime_spec_hooks)
+TEST(json_testcase, test_oci_runtime_spec_hooks)
 {
     const char *fname = "./ocihook.json";
     oci_runtime_spec_hooks *hooks = nullptr;
@@ -79,7 +79,7 @@ TEST(libocispec_testcase, test_oci_runtime_spec_hooks)
     free(jstr);
 }
 
-TEST(libocispec_testcase, test_json_readfile)
+TEST(json_testcase, test_json_readfile)
 {
     const char *fname = "./ocihook.json";
     const char *not_exist = "/tmp/not_exist.json";
diff --git a/tests/log_ut.cpp b/tests/log_llt.cpp
similarity index 100%
rename from tests/log_ut.cpp
rename to tests/log_llt.cpp