diff --git a/make_rootfs/rootfsimg_linux.sh b/make_rootfs/rootfsimg_linux.sh
index 7c2308f..f3eed24 100755
--- a/make_rootfs/rootfsimg_linux.sh
+++ b/make_rootfs/rootfsimg_linux.sh
@@ -99,7 +99,7 @@ elif [ "${FSTYPE}" = "ext4" ]; then
                 EMMC_ROOTFS_SIZE=50
             fi
         fi
-        COUNT_SIZE=`expr $EMMC_ROOTFS_SIZE \* 1024 \* 2`
+        COUNT_SIZE="$(expr ${EMMC_ROOTFS_SIZE} \* 1024 \* 2)"
         dd if=/dev/zero of=${ROOTFS_IMG} bs=512 count=${COUNT_SIZE}
         ${EXT4_TOOL} ${ROOTFS_IMG}
         ${EXT4_SH} ${ROOTFS_DIR} ${ROOTFS_IMG} ${CONFIG_PATH}
diff --git a/run_shell_cmd.py b/run_shell_cmd.py
index 2acf157..7a3ca23 100755
--- a/run_shell_cmd.py
+++ b/run_shell_cmd.py
@@ -15,12 +15,12 @@
 # limitations under the License.
 #
 
-import os
+import subprocess
 import sys
 
 
 def main():
-    return os.WEXITSTATUS(os.system(' '.join(sys.argv[1:])))
+    return subprocess.Popen(' '.join(sys.argv[1:]),shell=True).wait()
 
 
 if __name__ == '__main__':
diff --git a/setup.py b/setup.py
index 3c04838..9dcce82 100755
--- a/setup.py
+++ b/setup.py
@@ -21,9 +21,11 @@ from setuptools import setup
 
 from hb.__main__ import VERSION
 
+LONG_DESCRIPTION = ""
 WORK_PATH = os.path.abspath(os.path.dirname('__file__'))
 README_PATH = os.path.join(WORK_PATH, 'README.md')
-LONG_DESCRIPTION = open(README_PATH, 'r', encoding='utf-8').read()
+with open(README_PATH, 'r', encoding='utf-8') as FILE_DESCRIPTION:
+    LONG_DESCRIPTION = FILE_DESCRIPTION.read()
 
 setup(
     name='ohos-build',