diff --git a/aw/python/distributed/common/devices.py b/aw/python/distributed/common/devices.py
index 71803853a2ce9850decf534a9784254117ef9ade..ef0bb06f23007a6f9cc4ad5978d09881a44e66de 100755
--- a/aw/python/distributed/common/devices.py
+++ b/aw/python/distributed/common/devices.py
@@ -179,7 +179,6 @@ class DeviceAdapter:
             time.sleep(1)
         return return_code
 
-
     ###############################################################
     ###############################################################
 
@@ -199,6 +198,7 @@ class DeviceAdapter:
                     remote_ip, remote_port, device_sn)
         return device_para
 
+    @classmethod
     def execute_command(self, command, print_flag=True, timeout=900):
         try:
             if print_flag:
@@ -211,6 +211,7 @@ class DeviceAdapter:
         print("results: failed")
         return False
 
+    @classmethod
     def execute_command_with_output(self, command, print_flag=True):
         if print_flag:
             print("command: " + command)
@@ -248,6 +249,7 @@ class DeviceAdapter:
             command,
             QUOTATION_MARKS))
 
+    @classmethod
     def check_path_legal(self, path):
         if path and " " in path:
             return "\"%s\"" % path
@@ -318,7 +320,6 @@ class HDCDeviceAdapter:
         self.unlock_screen()
         self.unlock_device()
 
-
     ###############################################################
     ###############################################################
 
@@ -338,6 +339,7 @@ class HDCDeviceAdapter:
                     remote_ip, remote_port, device_sn)
         return device_para
 
+    @classmethod
     def execute_command(self, command, print_flag=True, timeout=900):
         try:
             if print_flag:
@@ -350,6 +352,7 @@ class HDCDeviceAdapter:
         print("results: failed")
         return False
 
+    @classmethod
     def execute_command_with_output(self, command, print_flag=True):
         if print_flag:
             print("command: " + command)
@@ -384,6 +387,7 @@ class HDCDeviceAdapter:
             command,
             QUOTATION_MARKS))
 
+    @classmethod
     def check_path_legal(self, path):
         if path and " " in path:
             return "\"%s\"" % path
diff --git a/aw/python/distributed/common/manager.py b/aw/python/distributed/common/manager.py
index 7d3f3e977d75f4ae5b3651c3dded7bf7191ba4e5..0cba2d64702705a9deb575fd4e209ba8f5a4bba4 100755
--- a/aw/python/distributed/common/manager.py
+++ b/aw/python/distributed/common/manager.py
@@ -79,6 +79,7 @@ class DeviceManager:
                 setattr(self, device.name, device)
         return
 
+    @classmethod
     def get_device_info_list(self):
         device_info_list = []
         tmp_path = os.path.join(os.environ.get('PYTEST_RESULTPATH'), "temp")
diff --git a/aw/python/distributed/distribute/distribute.py b/aw/python/distributed/distribute/distribute.py
index 10790d05d1050f93688c8d399e19c66f0a699b7b..29b0d8becba926d5402d9cb855be971f412c7abd 100755
--- a/aw/python/distributed/distribute/distribute.py
+++ b/aw/python/distributed/distribute/distribute.py
@@ -116,6 +116,7 @@ class Distribute:
         suite_path = os.path.join(self.suite_dir, target_name)
         return driver.execute(suite_path, background=False)
 
+    @classmethod
     def pull_result(self, device, source_path, result_save_path):
         _, file_name = os.path.split(source_path)
         device.pull_file(source_path, result_save_path)
@@ -123,6 +124,7 @@ class Distribute:
             create_empty_result_file(result_save_path, file_name)
         return
 
+    @classmethod
     def _check_thread(self, device, thread_name):
         check_command = "ps -A | grep %s" % thread_name
         checksum = 0
@@ -164,6 +166,7 @@ class Distribute:
         config_major_file = os.path.join(self.suite_dir, "major.desc")
         self._write_device_config(config_info, config_major_file)
 
+    @classmethod
     def _query_device_ip(self, device):
         output = device.shell_with_output("getprop ro.hardware")
         if output == "":
@@ -185,6 +188,7 @@ class Distribute:
 
         return ipaddress[0]
 
+    @classmethod
     def _query_device_uuid(self, device):
         """
         1. Run the dumpsys DdmpDeviceMonitorService command to query the value
@@ -209,6 +213,7 @@ class Distribute:
         dev_nodeid_info = device_info[begin:end].replace('"', "")
         return dev_nodeid_info.split(":")[1]
 
+    @classmethod
     def _write_device_config(self, device_info, file_path):
         file_dir, file_name = os.path.split(file_path)
         final_file = os.path.join(file_dir, file_name.split('.')[0] + ".desc")
diff --git a/examples/app_info/test/unittest/common/get_app_info/ExampleJsunit.test.js b/examples/app_info/test/unittest/common/get_app_info/ExampleJsunit.test.js
index d6e92a7a6a5204f8b0718e09f72c44a045f2d572..84f768238335f1af1fdd4d7aa1bb5fd9d3a60c17 100644
--- a/examples/app_info/test/unittest/common/get_app_info/ExampleJsunit.test.js
+++ b/examples/app_info/test/unittest/common/get_app_info/ExampleJsunit.test.js
@@ -18,6 +18,7 @@ import {describe, beforeAll, beforeEach, afterEach, afterAll, it, expect} from '
 
 describe("AppInfoTest", function () {
     beforeAll(function() {
+
         /*
          * @tc.setup: setup invoked before all testcases
          */
@@ -25,6 +26,7 @@ describe("AppInfoTest", function () {
     })
     
     afterAll(function() {
+
         /*
          * @tc.teardown: teardown invoked after all testcases
          */
@@ -32,6 +34,7 @@ describe("AppInfoTest", function () {
     })
     
     beforeEach(function() {
+
         /*
          * @tc.setup: setup invoked before each testcases
          */
@@ -39,6 +42,7 @@ describe("AppInfoTest", function () {
     })
     
     afterEach(function() {
+        
         /*
          * @tc.teardown: teardown invoked after each testcases
          */