diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index 53ca49e64a..e745e87d35 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -99,8 +99,6 @@ else()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0 -g -fPIC -DELPP_THREAD_SAFE -fopenmp")
 endif()
 
-
-
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
 include(ExternalProject)
@@ -132,6 +130,11 @@ link_directories(${CMAKE_CURRRENT_BINARY_DIR})
 
 add_subdirectory(src)
 
+if (BUILD_COVERAGE STREQUAL "ON")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage")
+endif()
+
+
 if (BUILD_UNIT_TEST)
     add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/unittest)
 endif(BUILD_UNIT_TEST)
diff --git a/cpp/build.sh b/cpp/build.sh
index 3af7b31bfb..fde45e8ce8 100755
--- a/cpp/build.sh
+++ b/cpp/build.sh
@@ -5,8 +5,9 @@ BUILD_UNITTEST="off"
 LICENSE_CHECK="OFF"
 INSTALL_PREFIX=$(pwd)/milvus
 MAKE_CLEAN="OFF"
+BUILD_COVERAGE="OFF"
 
-while getopts "p:t:uhlr" arg
+while getopts "p:t:uhlrc" arg
 do
         case $arg in
              t)
@@ -28,6 +29,9 @@ do
                     MAKE_CLEAN="ON"
                 fi
                 ;;
+             c)
+                BUILD_COVERAGE="ON"
+                ;;
              h) # help
                 echo "
 
@@ -37,9 +41,10 @@ parameter:
 -p: install prefix
 -l: build license version
 -r: remove previous build directory
+-c: code coverage
 
 usage:
-./build.sh -t \${BUILD_TYPE} [-u] [-h] [-g] [-r]
+./build.sh -t \${BUILD_TYPE} [-u] [-h] [-g] [-r] [-c]
                 "
                 exit 0
                 ;;
@@ -65,6 +70,7 @@ if [[ ${MAKE_CLEAN} = "ON" ]]; then
     -DCMAKE_BUILD_TYPE=${BUILD_TYPE} \
     -DCMAKE_CUDA_COMPILER=${CUDA_COMPILER} \
     -DCMAKE_LICENSE_CHECK=${LICENSE_CHECK} \
+    -DBUILD_COVERAGE=${BUILD_COVERAGE} \
     $@ ../"
     echo ${CMAKE_CMD}
 
@@ -78,5 +84,8 @@ if [[ ${BUILD_TYPE} != "Debug" ]]; then
     strip src/milvus_server
 fi
 
-make install
+if [[ ${BUILD_COVERAGE} = "ON" ]]; then
+    bash coverage.sh
+fi
 
+make install
diff --git a/cpp/coverage.sh b/cpp/coverage.sh
new file mode 100644
index 0000000000..39e1b1870c
--- /dev/null
+++ b/cpp/coverage.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+LCOV_CMD="lcov"
+LCOV_GEN_CMD="genhtml"
+
+FILE_INFO_BASE="base.info"
+FILE_INFO_MILVUS="server.info"
+FILE_INFO_OUTPUT="output.info"
+FILE_INFO_OUTPUT_NEW="output_new.info"
+DIR_LCOV_OUTPUT="lcov_out"
+
+DIR_GCNO="cmake_build"
+DIR_UNITTEST="milvus/bin"
+
+# get baseline
+${LCOV_CMD} -c -i -d ${DIR_GCNO} -o "${FILE_INFO_BASE}"
+if [ $? -ne 0 ]; then
+    echo "gen baseline coverage run failed"
+    exit -1
+fi
+
+for test in `ls ${DIR_UNITTEST}`; do
+    echo $test
+    case ${test} in 
+        *_test)
+            # run unittest
+            ./${DIR_UNITTEST}/${test}
+            if [ $? -ne 0 ]; then
+                echo ${DIR_UNITTEST}/${test} "run failed"
+            fi
+    esac
+done
+
+# gen test converage
+${LCOV_CMD} -d ${DIR_GCNO} -o "${FILE_INFO_MILVUS}" -c -b
+# merge coverage
+${LCOV_CMD} -a ${FILE_INFO_BASE} -a ${FILE_INFO_MILVUS} -o "${FILE_INFO_OUTPUT}"
+
+# remove third party from tracefiles
+${LCOV_CMD} -r "${FILE_INFO_OUTPUT}" -o "${FILE_INFO_OUTPUT_NEW}" \
+    "/usr/*" \
+    "*/boost/*" \
+    "*/cmake_build/*_ep-prefix/*" \
+
+# gen html report
+${LCOV_GEN_CMD} "${FILE_INFO_OUTPUT_NEW}" --output-directory ${DIR_LCOV_OUTPUT}/