diff --git a/device/wistron/x86_64-wistron_6512_32r-r0/sonic_platform/chassis.py b/device/wistron/x86_64-wistron_6512_32r-r0/sonic_platform/chassis.py
index 232ca0ca5fe..2f240abbf1d 100644
--- a/device/wistron/x86_64-wistron_6512_32r-r0/sonic_platform/chassis.py
+++ b/device/wistron/x86_64-wistron_6512_32r-r0/sonic_platform/chassis.py
@@ -8,7 +8,6 @@
 #############################################################################
 try:
     import sys
-    import os
     import time
     import subprocess
     from sonic_platform_base.chassis_base import ChassisBase
@@ -23,9 +22,9 @@
 PMON_REBOOT_CAUSE_PATH = "/usr/share/sonic/platform/api_files/reboot-cause/"
 REBOOT_CAUSE_FILE = "reboot-cause.txt"
 PREV_REBOOT_CAUSE_FILE = "previous-reboot-cause.txt"
-HOST_CHK_CMD = "docker > /dev/null 2>&1"
-GET_HWSKU_CMD = "sonic-cfggen -d -v DEVICE_METADATA.localhost.hwsku"
-GET_PLATFORM_CMD = "sonic-cfggen -d -v DEVICE_METADATA.localhost.platform"
+HOST_CHK_CMD = ["docker"]
+GET_HWSKU_CMD = ["sonic-cfggen", "-d", "-v", "DEVICE_METADATA.localhost.hwsku"]
+GET_PLATFORM_CMD = ["sonic-cfggen", "-d", "-v", "DEVICE_METADATA.localhost.platform"]
 
 class Chassis(ChassisBase):
     """Platform-specific Chassis class"""
@@ -76,7 +75,7 @@ def __initialize_eeprom(self):
         self._eeprom = Tlv()
 
     def __is_host(self):
-        return os.system(HOST_CHK_CMD) == 0
+        return subprocess.call(HOST_CHK_CMD) == 0
 
     def __read_txt_file(self, file_path):
         try:
@@ -141,12 +140,12 @@ def get_reboot_cause(self):
         return (reboot_cause, description)
 
     def _get_sku_name(self):
-        p = subprocess.Popen(GET_HWSKU_CMD, shell=True, stdout=subprocess.PIPE)
+        p = subprocess.Popen(GET_HWSKU_CMD, stdout=subprocess.PIPE)
         out, err = p.communicate()
         return out.decode().rstrip('\n')
 
     def _get_platform_name(self):
-        p = subprocess.Popen(GET_PLATFORM_CMD, shell=True, stdout=subprocess.PIPE)
+        p = subprocess.Popen(GET_PLATFORM_CMD, stdout=subprocess.PIPE)
         out, err = p.communicate()
         return out.decode().rstrip('\n')
 
@@ -206,7 +205,7 @@ def get_change_event(self, timeout=0):
                         port_dict[port] = '0'
 
             self._transceiver_presence = cur_presence
-            if change_event == True:
+            if change_event is True:
                 break
 
             if not forever: