diff --git a/device/rockchip/common/device.mk b/device/rockchip/common/device.mk
index 7f6d22aaf6..16c480efcd 100755
--- a/device/rockchip/common/device.mk
+++ b/device/rockchip/common/device.mk
@@ -38,6 +38,9 @@ PRODUCT_PROPERTY_OVERRIDES += \
 #PRODUCT_PACKAGES += \
     fsck.f2fs mkfs.f2fs
 
+PRODUCT_PROPERTY_OVERRIDES += \
+    sys.status.hidebar_enable=false
+
 ifeq ($(strip $(BOARD_USE_LCDC_COMPOSER)), true)
 # setup dalvik vm configs.
 $(call inherit-product, frameworks/native/build/tablet-10in-xhdpi-2048-dalvik-heap.mk)
diff --git a/frameworks/base/core/java/android/provider/Settings.java b/frameworks/base/core/java/android/provider/Settings.java
index b05d3e99a2..46c6607314 100644
--- a/frameworks/base/core/java/android/provider/Settings.java
+++ b/frameworks/base/core/java/android/provider/Settings.java
@@ -1786,6 +1786,13 @@ public final class Settings {
           * @hide
           */
         public static final String SCREENSHOT_BUTTON_SHOW="screenshot_button_show";
+        
+        /**
+         *hide system bar
+         * @hide
+         */
+        public static final String SYSTEMBAR_HIDE="systembar_hide";
+
         /**
          * launcher app start  add by lly
          * @hide
diff --git a/frameworks/base/packages/SettingsProvider/res/values/defaults.xml b/frameworks/base/packages/SettingsProvider/res/values/defaults.xml
index 78ee80656b..4cf29ea060 100644
--- a/frameworks/base/packages/SettingsProvider/res/values/defaults.xml
+++ b/frameworks/base/packages/SettingsProvider/res/values/defaults.xml
@@ -19,6 +19,7 @@
 <resources>
     <!-- should show the screenshot button default -->
     <bool name="def_screenshot_button_show">false</bool>
+    <bool name="def_systembar_hide">false</bool>
     <!-- the store location of screen capture by default-->
     <string name="def_screenshot_location">/mnt/sdcard</string>
     <bool name="def_dim_screen">true</bool>
diff --git a/frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java b/frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
index ae2136047e..398ac2d3e7 100644
--- a/frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
+++ b/frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
@@ -2328,6 +2328,9 @@ public class DatabaseHelper extends SQLiteOpenHelper {
             loadSetting(stmt, Settings.System.TTY_MODE, 0);
             loadBooleanSetting(stmt, Settings.System.SCREENSHOT_BUTTON_SHOW,
                     R.bool.def_screenshot_button_show);
+                    
+            loadBooleanSetting(stmt, Settings.System.SYSTEMBAR_HIDE,
+                    R.bool.def_systembar_hide);
 
             String enableUms= SystemProperties.get("ro.factory.hasUMS","false");
             if("true".equals(enableUms))//if has UMS function,flash is primary storage
diff --git a/frameworks/base/packages/SystemUI/res/layout-sw600dp/navigation_bar.xml b/frameworks/base/packages/SystemUI/res/layout-sw600dp/navigation_bar.xml
index 1cf7332eb8..31d34e02fd 100755
--- a/frameworks/base/packages/SystemUI/res/layout-sw600dp/navigation_bar.xml
+++ b/frameworks/base/packages/SystemUI/res/layout-sw600dp/navigation_bar.xml
@@ -245,7 +245,7 @@
                 /-->
              <!--$_rbox_$_modify_$_huangjc_begin-->
                <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/hide_bar"
-               android:layout_width="0dp"
+               android:layout_width="48dp"
                 android:layout_height="match_parent"
                 android:src="@drawable/ic_sysbar_hide"
                 android:layout_weight="0"
diff --git a/frameworks/base/packages/SystemUI/res/layout-sw720dp/navigation_bar.xml b/frameworks/base/packages/SystemUI/res/layout-sw720dp/navigation_bar.xml
index 3c5b45dbf5..88aaa329c5 100755
--- a/frameworks/base/packages/SystemUI/res/layout-sw720dp/navigation_bar.xml
+++ b/frameworks/base/packages/SystemUI/res/layout-sw720dp/navigation_bar.xml
@@ -245,8 +245,8 @@
                 /-->
             <!--$_rbox_$_modify_$_huangjc_begin-->
                <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/hide_bar"
-               android:layout_width="0dp"
-                android:layout_height="0dp"
+               android:layout_width="48dp"
+                android:layout_height="match_parent"
                 android:src="@drawable/ic_sysbar_hide"
                 android:layout_weight="0"
                 android:contentDescription="@string/accessibility_recent"
diff --git a/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml b/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
index 0cd35c085b..dc1f2383f8 100755
--- a/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
+++ b/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
@@ -263,8 +263,8 @@
                 /-->
              <!--$_rbox_$_modify_$_huangjc_begin-->
                <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/hide_bar"
-               android:layout_width="0dp"
-                android:layout_height="0dp"
+               android:layout_width="30dp"
+                android:layout_height="match_parent"
                 android:src="@drawable/ic_sysbar_hide"
                 android:layout_weight="0"
                 android:contentDescription="@string/accessibility_recent"
diff --git a/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java b/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
index 3b349cf7e5..7d3255870a 100755
--- a/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
+++ b/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
@@ -111,6 +111,10 @@ import android.view.animation.DecelerateInterpolator;
 import android.view.animation.Interpolator;
 import android.view.animation.LinearInterpolator;
 import android.view.animation.PathInterpolator;
+import android.view.IWindowManager;
+import android.view.WindowManagerGlobal;
+import android.view.Surface;
+
 import android.widget.FrameLayout;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
@@ -611,6 +615,7 @@ public class PhoneStatusBar extends BaseStatusBar implements DemoMode,
         // in session state
 
         addNavigationBar();
+        changeBarHideStatus();
 
         // Lastly, call to the icon policy to install/update all the icons.
         mIconPolicy = new PhoneStatusBarPolicy(mContext, mCastController, mHotspotController);
@@ -1059,6 +1064,7 @@ final Object mScreenshotLock = new Object();
             filter.addAction("fake_artwork");
         }
         filter.addAction(ACTION_DEMO);
+        filter.addAction("com.tchip.changeBarHideStatus");
         context.registerReceiverAsUser(mBroadcastReceiver, UserHandle.ALL, filter, null, null);
 
         // listen for USER_SETUP_COMPLETE setting (per-user)
@@ -1369,9 +1375,27 @@ final Object mScreenshotLock = new Object();
         };
 
         private boolean mBarIsAdd = true;
+	private static final int MSG_CHANGE_BAR_HIDE_STATUS = 2030;
+
+        private void changeBarHideStatus()
+        {
+            boolean hide_systembar = Settings.System.getInt(mContext.getContentResolver(),Settings.System.SYSTEMBAR_HIDE,0)==1;
+
+            if(hide_systembar)
+                removeBar(false);
+            else{
+                addBarInside(hide_systembar);   
+            }
+        }
+
         private void addBarInside(){
-                if (!mBarIsAdd){
-                        Log.d(TAG,"add Bar");
+            boolean hide_systembar = Settings.System.getInt(mContext.getContentResolver(),Settings.System.SYSTEMBAR_HIDE,0)==1;
+            addBarInside(hide_systembar);
+        }
+
+        private void addBarInside(boolean alwaysHide){
+            if (!mBarIsAdd && !alwaysHide){
+                Log.d(TAG,"add Bar");
             
           try {
             boolean showNav = mWindowManagerService.hasNavigationBar();
@@ -1398,31 +1422,36 @@ final Object mScreenshotLock = new Object();
                         checkUserAutohide(v, event);
                         return false;
                     }});
-            }
-        } catch (RemoteException ex) {
-            // no window manager? good luck with that
-        }
-                        addNavigationBar();
-                      /*  if (mNavigationBarView != null)
-                                mWindowManager.addView(mNavigationBarView,(WindowManager.LayoutParams) mNavigationBarView.getLayoutParams());
-                        if (mStatusBarWindow != null)
-                                mWindowManager.addView(mStatusBarWindow,
-                                      (WindowManager.LayoutParams) mStatusBarWindow.getLayoutParams());
-                     */
-                        mBarIsAdd = true;
                 }
+            } catch (RemoteException ex) {
+            // no window manager? good luck with that
+            }
+
+            addNavigationBar();
+            if (mNavigationBarView != null)
+            {
+                setInteracting(StatusBarManager.WINDOW_STATUS_BAR, true);
+            }
+            if (mStatusBarWindow != null)
+                mStatusBarWindow.setVisibility(View.VISIBLE);
+                mBarIsAdd = true;
+            }
         }
 
         private void removeBar(){
+            removeBar(true);
+        }
+
+        private void removeBar(boolean needToast){
                 if (mBarIsAdd){
                         Log.d(TAG,"remove Bar");
                         if (mNavigationBarView != null)
                                 mWindowManager.removeView(mNavigationBarView);
-                       /* if (mStatusBarWindow != null)
-                                mWindowManager.removeView(mStatusBarWindow);
-                       */
+                        if (mStatusBarWindow != null)
+                                //mWindowManager.removeView(mStatusBarWindow);
+                                mStatusBarWindow.setVisibility(View.GONE);
                         mBarIsAdd = false;
-                        
+                        if(needToast)
                         Toast.makeText(mContext, mContext.getResources().getString(R.string.hidebar_msg)
 , 3000).show();
                 }
@@ -2470,6 +2499,9 @@ final Object mScreenshotLock = new Object();
                     escalateHeadsUp();
                     setHeadsUpVisibility(false);
                     break;
+                case MSG_CHANGE_BAR_HIDE_STATUS:
+                       changeBarHideStatus();
+                       break;
                 case MSG_LAUNCH_TRANSITION_TIMEOUT:
                     onLaunchTransitionTimeout();
                     break;
@@ -3405,6 +3437,11 @@ final Object mScreenshotLock = new Object();
                 if (DEBUG_MEDIA_FAKE_ARTWORK) {
                     updateMediaMetaData(true);
                 }
+            }  else if("com.tchip.changeBarHideStatus".equals(action))
+            {
+                       mHandler.removeMessages(MSG_CHANGE_BAR_HIDE_STATUS);
+                       mHandler.sendEmptyMessageDelayed(MSG_CHANGE_BAR_HIDE_STATUS, 400);
+                //changeBarHideStatus();
             }
         }
     };
diff --git a/packages/apps/Settings/res/values-zh-rCN/strings.xml b/packages/apps/Settings/res/values-zh-rCN/strings.xml
index a5ad2f8e15..8d604692c3 100644
--- a/packages/apps/Settings/res/values-zh-rCN/strings.xml
+++ b/packages/apps/Settings/res/values-zh-rCN/strings.xml
@@ -2724,4 +2724,6 @@
     <string name="pick_ok">确认</string>
     <string name="pick_setting">设置</string>
     <string name="sim_change_title">SIM卡发生变化</string>
+    
+    <string name="systembar_hide_title">永久隐藏工具栏</string>
 </resources>
diff --git a/packages/apps/Settings/res/values/strings.xml b/packages/apps/Settings/res/values/strings.xml
index 53caca44ca..a4cfcfa92e 100644
--- a/packages/apps/Settings/res/values/strings.xml
+++ b/packages/apps/Settings/res/values/strings.xml
@@ -6267,5 +6267,7 @@
     <string name="m_vertical_screen">Vertical screen</string>
     <string name="m_reverse_horizontal">Reverse horizontal screen</string>
     <string name="m_reverse_vertical">Reverse vertical screen</string>
+    
+    <string name="systembar_hide_title">Always hide the status bar</string>
 
 </resources>
diff --git a/packages/apps/Settings/res/xml/display_settings.xml b/packages/apps/Settings/res/xml/display_settings.xml
index 55a2f0232a..b65cd1c452 100644
--- a/packages/apps/Settings/res/xml/display_settings.xml
+++ b/packages/apps/Settings/res/xml/display_settings.xml
@@ -32,6 +32,10 @@
                 settings:keywords="@string/keywords_display_auto_brightness"
                 android:summary="@string/auto_brightness_summary"
                 android:persistent="false" />
+                
+        <CheckBoxPreference
+                android:key="systembar_hide"
+                android:title="@string/systembar_hide_title"/>
 
         <SwitchPreference
                 android:key="button_lights_enable"
diff --git a/packages/apps/Settings/src/com/android/settings/DisplaySettings.java b/packages/apps/Settings/src/com/android/settings/DisplaySettings.java
index 4ca4262cce..8505fd409c 100644
--- a/packages/apps/Settings/src/com/android/settings/DisplaySettings.java
+++ b/packages/apps/Settings/src/com/android/settings/DisplaySettings.java
@@ -81,6 +81,7 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
     /** If there is no setting in the provider, use this. */
     private static final int FALLBACK_BUTTON_LIGHTS_TIMEOUT_VALUE = 1500;
 
+    private static final String KEY_SYSTEMBAR_HIDE = "systembar_hide";
     private static final String KEY_SCREEN_ORIENTATION = "screen_orientation";
 
     private static final String KEY_SCREEN_TIMEOUT = "screen_timeout";
@@ -97,6 +98,7 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
 
     private static final String KEYBOARD_BACKLIGHTS_FILE = "/sys/class/leds/keyboard-backlight/brightness";
 
+    private CheckBoxPreference mSystemBarHide;
     private CheckBoxPreference mAccelerometer;
     private WarnedListPreference mFontSizePref;
     private CheckBoxPreference mNotificationPulse;
@@ -157,7 +159,7 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
             getPreferenceScreen().removePreference(mScreenSaverPreference);
         }
 
-
+        mSystemBarHide = (CheckBoxPreference) findPreference(KEY_SYSTEMBAR_HIDE);
 
         mScreenOrientationPreference = (ListPreference) findPreference(KEY_SCREEN_ORIENTATION);
    		 mScreenOrientationPreference.setOnPreferenceChangeListener(this);
@@ -840,6 +842,7 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
     private void updateState() {
         readFontSizePreference(mFontSizePref);
         updateScreenSaverSummary();
+        updateSystemBarHideCheckBox();
 
         // Update button lights enable if it is available.
         if (mButtonLightsPreference != null) {
@@ -875,6 +878,13 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
         }
     }
 
+    private void updateSystemBarHideCheckBox(){
+        boolean hide_systembar = Settings.System.getInt(getContentResolver(),Settings.System.SYSTEMBAR_HIDE,0)==1;
+        mSystemBarHide.setChecked(hide_systembar);
+
+    }
+
+
     public void writeFontSizePreference(Object objValue) {
         try {
             mCurConfig.fontScale = Float.parseFloat(objValue.toString());
@@ -886,6 +896,13 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
 
     @Override
     public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
+        if(preference == mSystemBarHide)
+        {
+            Settings.System.putInt(getContentResolver(), Settings.System.SYSTEMBAR_HIDE,
+                    mSystemBarHide.isChecked() ? 1 : 0);
+            Intent i = new Intent("com.tchip.changeBarHideStatus");
+            getActivity().sendBroadcast(i);
+        }
         return super.onPreferenceTreeClick(preferenceScreen, preference);
     }