diff --git a/extension/src/xdevice_extension/_core/testkit/kit.py b/extension/src/xdevice_extension/_core/testkit/kit.py
index 107aa46358c90c72cbde36afa2583abfb9f03b13..fc6806a409299e3522249e1568f4b2aaed7e1686 100644
--- a/extension/src/xdevice_extension/_core/testkit/kit.py
+++ b/extension/src/xdevice_extension/_core/testkit/kit.py
@@ -648,7 +648,7 @@ class AppInstallKit(ITestKit):
 
 
 def remount(device):
-    cmd = "mount -o rw,remount /" \
+    cmd = "shell mount -o rw,remount /" \
         if device.usb_type == DeviceConnectorType.hdc else "remount"
     device.hdc_command(cmd)
 
diff --git a/src/xdevice/_core/constants.py b/src/xdevice/_core/constants.py
index 0d0ad4cb30d63ce7465eafb2f2ec8f81c0c82c46..773f02b981b27211c42733258b8180624d5f8bc9 100644
--- a/src/xdevice/_core/constants.py
+++ b/src/xdevice/_core/constants.py
@@ -124,7 +124,6 @@ class DeviceTestType(object):
     DeviceTestType enumeration
     """
     cpp_test = "CppTest"
-    dex_test = "DexTest"
     hap_test = "HapTest"
     junit_test = "JUnitTest"
     jsunit_test = "JSUnitTest"
@@ -155,7 +154,6 @@ class HostDrivenTestType(object):
 
 TEST_DRIVER_SET = {
     DeviceTestType.cpp_test,
-    DeviceTestType.dex_test,
     DeviceTestType.hap_test,
     DeviceTestType.junit_test,
     DeviceTestType.jsunit_test,
diff --git a/src/xdevice/_core/executor/source.py b/src/xdevice/_core/executor/source.py
index eabbbc5320c131b3457f180889d7de3b52b91eda..1e093aefeeed6af6b72950c09bb2890691db05b5 100644
--- a/src/xdevice/_core/executor/source.py
+++ b/src/xdevice/_core/executor/source.py
@@ -38,14 +38,12 @@ TestSetSource = namedtuple('TestSetSource', 'set')
 TestSource = namedtuple('TestSource', 'source_file source_string config_file '
                                       'test_name test_type module_name')
 
-TEST_TYPE_DICT = {"DEX": DeviceTestType.dex_test,
-                  "HAP": DeviceTestType.hap_test,
+TEST_TYPE_DICT = {"HAP": DeviceTestType.hap_test,
                   "PYT": HostDrivenTestType.device_test,
                   "JST": DeviceTestType.jsunit_test,
                   "CXX": DeviceTestType.cpp_test,
                   "BIN": DeviceTestType.lite_cpp_test}
-EXT_TYPE_DICT = {".dex": DeviceTestType.dex_test,
-                 ".hap": DeviceTestType.hap_test,
+EXT_TYPE_DICT = {".hap": DeviceTestType.hap_test,
                  ".py": HostDrivenTestType.device_test,
                  ".js": DeviceTestType.jsunit_test,
                  ".bin": DeviceTestType.lite_cpp_test,