diff --git a/mace_tools.py b/mace_tools.py
index b4b077321bf97ed82e0444dc9b26ca4593c97378..9ca311a46132ce052905d8a3a1273a22e9aec1e8 100644
--- a/mace_tools.py
+++ b/mace_tools.py
@@ -153,7 +153,9 @@ def parse_sub_model_configs(model_dirs, global_configs):
         for config_map in config_list:
           model_config[config_map[0]] = config_map[1]
       else:
-        print("No config msg found in {}".format(model_config_path))
+        raise Exception("No config msg found in {}".format(model_config_path))
+    else:
+      raise Exception("Config file '{}' not found".format(model_config_path))
 
     model_config[tf_model_file_dir_key] = model_dir
 
@@ -242,6 +244,9 @@ def main(unused_args):
 
   get_libs(configs)
 
+  if FLAGS.mode == "run" and len(configs) > 1:
+    raise Exception("Mode 'run' only can execute one model config, which have been built lastest")
+
   model_output_dirs = []
   for config in configs:
     # Transfer params by environment
diff --git a/merge_libs.sh b/merge_libs.sh
index 89de1135850bbbe3c3535f51522b4d2140518fe1..59667f7001a292e9d26b350f2dfa31d32bfaad0f 100644
--- a/merge_libs.sh
+++ b/merge_libs.sh
@@ -25,34 +25,30 @@ do
 done
 cp ${LIBMACE_SOURCE_DIR}/lib/hexagon/libhexagon_controller.so ${LIBMACE_BUILD_DIR}/libmace/lib
 
-# Merge opencl and tuning code with mace engine
 LIBMACE_TEMP_DIR=`mktemp -d -t libmace.XXXX`
-mkdir -p ${LIBMACE_TEMP_DIR}/lib
 
-cp lib/mace/libmace.a \
-  lib/mace/libmace_prod.a \
-  ${LIBMACE_TEMP_DIR}/lib/
+# Merge libmace engine
+echo "create ${LIBMACE_BUILD_DIR}/libmace/lib/libmace_engine.a" > ${LIBMACE_TEMP_DIR}/libmace_engine.mri
+echo "addlib lib/mace/libmace.a" >> ${LIBMACE_TEMP_DIR}/libmace_engine.mri
+echo "addlib lib/mace/libmace_prod.a" >> ${LIBMACE_TEMP_DIR}/libmace_engine.mri
+echo "save" >> ${LIBMACE_TEMP_DIR}/libmace_engine.mri
+echo "end" >> ${LIBMACE_TEMP_DIR}/libmace_engine.mri
+$ANDROID_NDK_HOME/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-ar \
+    -M < ${LIBMACE_TEMP_DIR}/libmace_engine.mri || exit 1
 
+# Merge opencl bin and tuning result
+echo "create ${LIBMACE_BUILD_DIR}/libmace/lib/libmace_opencl.a" > ${LIBMACE_TEMP_DIR}/libmace_opencl.mri
 if [ x"RUNTIME" = x"local" ]; then
-  cp bazel-bin/codegen/libgenerated_opencl_prod.pic.a \
-    bazel-bin/codegen/libgenerated_tuning_params.pic.a \
-    ${LIBMACE_TEMP_DIR}/lib/
+  echo "addlib bazel-bin/codegen/libgenerated_opencl_prod.pic.a" >> ${LIBMACE_TEMP_DIR}/libmace_opencl.mri
+  echo "addlib bazel-bin/codegen/libgenerated_tuning_params.pic.a" >> ${LIBMACE_TEMP_DIR}/libmace_opencl.mri
 else
-  cp bazel-bin/codegen/libgenerated_opencl_prod.a \
-    bazel-bin/codegen/libgenerated_tuning_params.a \
-    ${LIBMACE_TEMP_DIR}/lib/
+  echo "addlib bazel-bin/codegen/libgenerated_opencl_prod.a" >> ${LIBMACE_TEMP_DIR}/libmace_opencl.mri
+  echo "addlib bazel-bin/codegen/libgenerated_tuning_params.a" >> ${LIBMACE_TEMP_DIR}/libmace_opencl.mri
 fi
-
-echo "create ${LIBMACE_BUILD_DIR}/libmace/lib/libmace_${PROJECT_NAME}.a" > ${LIBMACE_TEMP_DIR}/libmace.mri
-for static_lib in `ls ${LIBMACE_TEMP_DIR}/lib/`
-do
-  echo "addlib ${LIBMACE_TEMP_DIR}/lib/${static_lib}" >> ${LIBMACE_TEMP_DIR}/libmace.mri
-done
-echo "save" >> ${LIBMACE_TEMP_DIR}/libmace.mri
-echo "end" >> ${LIBMACE_TEMP_DIR}/libmace.mri
-
+echo "save" >> ${LIBMACE_TEMP_DIR}/libmace_opencl.mri
+echo "end" >> ${LIBMACE_TEMP_DIR}/libmace_opencl.mri
 $ANDROID_NDK_HOME/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-ar \
-    -M < ${LIBMACE_TEMP_DIR}/libmace.mri || exit 1
+    -M < ${LIBMACE_TEMP_DIR}/libmace_opencl.mri || exit 1
 
 rm -rf ${LIBMACE_TEMP_DIR}