diff --git a/frame/frame.pro b/frame/frame.pro
index abcf59ee9..4c0230c6e 100644
--- a/frame/frame.pro
+++ b/frame/frame.pro
@@ -33,7 +33,8 @@ SOURCES += main.cpp \
     dbus/dbusxmousearea.cpp \
     item/stretchitem.cpp \
     item/placeholderitem.cpp \
-    controller/dockpluginloader.cpp
+    controller/dockpluginloader.cpp \
+    item/containeritem.cpp
 
 HEADERS  += \
     window/mainwindow.h \
@@ -58,7 +59,8 @@ HEADERS  += \
     dbus/dbusxmousearea.h \
     item/stretchitem.h \
     item/placeholderitem.h \
-    controller/dockpluginloader.h
+    controller/dockpluginloader.h \
+    item/containeritem.h
 
 dbus_service.files += com.deepin.dde.dock.service
 dbus_service.path = /usr/share/dbus-1/services
diff --git a/frame/item/appitem.cpp b/frame/item/appitem.cpp
index 353eb7a48..b3baed502 100644
--- a/frame/item/appitem.cpp
+++ b/frame/item/appitem.cpp
@@ -14,7 +14,7 @@ int AppItem::IconBaseSize;
 QPoint AppItem::MousePressPos;
 
 AppItem::AppItem(const QDBusObjectPath &entry, QWidget *parent)
-    : DockItem(App, parent),
+    : DockItem(parent),
       m_appNameTips(new QLabel(this)),
       m_itemEntry(new DBusDockEntry(entry.path(), this)),
       m_draging(false),
diff --git a/frame/item/appitem.h b/frame/item/appitem.h
index a002d5be0..5f817bfd2 100644
--- a/frame/item/appitem.h
+++ b/frame/item/appitem.h
@@ -19,6 +19,8 @@ public:
     static int itemBaseHeight();
     static int itemBaseWidth();
 
+    inline ItemType itemType() const {return App;}
+
 private:
     void paintEvent(QPaintEvent *e);
     void mouseReleaseEvent(QMouseEvent *e);
diff --git a/frame/item/containeritem.cpp b/frame/item/containeritem.cpp
new file mode 100644
index 000000000..3a95bc111
--- /dev/null
+++ b/frame/item/containeritem.cpp
@@ -0,0 +1,7 @@
+#include "containeritem.h"
+
+ContainerItem::ContainerItem(QWidget *parent)
+    : DockItem(parent)
+{
+
+}
diff --git a/frame/item/containeritem.h b/frame/item/containeritem.h
new file mode 100644
index 000000000..3c138f36f
--- /dev/null
+++ b/frame/item/containeritem.h
@@ -0,0 +1,16 @@
+#ifndef CONTAINERITEM_H
+#define CONTAINERITEM_H
+
+#include "dockitem.h"
+
+class ContainerItem : public DockItem
+{
+    Q_OBJECT
+
+public:
+    explicit ContainerItem(QWidget *parent = 0);
+
+    inline ItemType itemType() const {return Container;}
+};
+
+#endif // CONTAINERITEM_H
diff --git a/frame/item/dockitem.cpp b/frame/item/dockitem.cpp
index ebcc64668..7321bd9ef 100644
--- a/frame/item/dockitem.cpp
+++ b/frame/item/dockitem.cpp
@@ -10,9 +10,8 @@ Position DockItem::DockPosition = Position::Top;
 DisplayMode DockItem::DockDisplayMode = DisplayMode::Efficient;
 std::unique_ptr<DockPopupWindow> DockItem::PopupWindow(nullptr);
 
-DockItem::DockItem(const ItemType type, QWidget *parent)
+DockItem::DockItem(QWidget *parent)
     : QWidget(parent),
-      m_type(type),
       m_hover(false),
       m_popupShown(false),
 
@@ -49,11 +48,6 @@ void DockItem::setDockDisplayMode(const DisplayMode mode)
     DockDisplayMode = mode;
 }
 
-DockItem::ItemType DockItem::itemType() const
-{
-    return m_type;
-}
-
 void DockItem::updatePopupPosition()
 {
     if (!m_popupShown || !PopupWindow->isVisible())
diff --git a/frame/item/dockitem.h b/frame/item/dockitem.h
index fcd28df3b..c6d2e9306 100644
--- a/frame/item/dockitem.h
+++ b/frame/item/dockitem.h
@@ -21,16 +21,17 @@ public:
         App,
         Stretch,
         Plugins,
+        Container,
     };
 
 public:
-    explicit DockItem(const ItemType type, QWidget *parent = nullptr);
+    explicit DockItem(QWidget *parent = nullptr);
     ~DockItem();
 
     static void setDockPosition(const Position side);
     static void setDockDisplayMode(const DisplayMode mode);
 
-    ItemType itemType() const;
+    inline virtual ItemType itemType() const = 0;
 
 signals:
     void dragStarted() const;
@@ -61,7 +62,6 @@ private:
     void showPopupWindow(QWidget * const content, const bool model = false);
 
 protected:
-    ItemType m_type;
     bool m_hover;
     bool m_popupShown;
 
diff --git a/frame/item/launcheritem.cpp b/frame/item/launcheritem.cpp
index 3d4d39495..55bae2246 100644
--- a/frame/item/launcheritem.cpp
+++ b/frame/item/launcheritem.cpp
@@ -7,7 +7,7 @@
 #include <QMouseEvent>
 
 LauncherItem::LauncherItem(QWidget *parent)
-    : DockItem(DockItem::Launcher, parent),
+    : DockItem(parent),
 
       m_tips(new QLabel(this))
 {
diff --git a/frame/item/launcheritem.h b/frame/item/launcheritem.h
index a6b4e639d..8ed4d78b6 100644
--- a/frame/item/launcheritem.h
+++ b/frame/item/launcheritem.h
@@ -10,6 +10,8 @@ class LauncherItem : public DockItem
 public:
     explicit LauncherItem(QWidget *parent = 0);
 
+    inline ItemType itemType() const {return Launcher;}
+
 private:
     void paintEvent(QPaintEvent *e);
     void resizeEvent(QResizeEvent *e);
diff --git a/frame/item/placeholderitem.cpp b/frame/item/placeholderitem.cpp
index 6579d9f22..8d35598d2 100644
--- a/frame/item/placeholderitem.cpp
+++ b/frame/item/placeholderitem.cpp
@@ -1,6 +1,6 @@
 #include "placeholderitem.h"
 
 PlaceholderItem::PlaceholderItem(QWidget *parent)
-    : DockItem(App, parent)
+    : DockItem(parent)
 {
 }
diff --git a/frame/item/placeholderitem.h b/frame/item/placeholderitem.h
index ada516ceb..d90354bb0 100644
--- a/frame/item/placeholderitem.h
+++ b/frame/item/placeholderitem.h
@@ -9,6 +9,9 @@ class PlaceholderItem : public DockItem
 
 public:
     explicit PlaceholderItem(QWidget *parent = 0);
+
+    // fake as app item
+    inline ItemType itemType() const {return App;}
 };
 
 #endif // PLACEHOLDERITEM_H
diff --git a/frame/item/pluginsitem.cpp b/frame/item/pluginsitem.cpp
index 16c7ecca9..e90838097 100644
--- a/frame/item/pluginsitem.cpp
+++ b/frame/item/pluginsitem.cpp
@@ -14,7 +14,7 @@
 QPoint PluginsItem::MousePressPoint = QPoint();
 
 PluginsItem::PluginsItem(PluginsItemInterface* const pluginInter, const QString &itemKey, QWidget *parent)
-    : DockItem(Plugins, parent),
+    : DockItem(parent),
       m_pluginInter(pluginInter),
       m_centeralWidget(m_pluginInter->itemWidget(itemKey)),
       m_itemKey(itemKey),
diff --git a/frame/item/pluginsitem.h b/frame/item/pluginsitem.h
index 85233ac8a..30f754af7 100644
--- a/frame/item/pluginsitem.h
+++ b/frame/item/pluginsitem.h
@@ -15,6 +15,8 @@ public:
     int itemSortKey() const;
     void detachPluginWidget();
 
+    inline ItemType itemType() const {return Plugins;}
+
 private:
     void mousePressEvent(QMouseEvent *e);
     void mouseMoveEvent(QMouseEvent *e);
diff --git a/frame/item/stretchitem.cpp b/frame/item/stretchitem.cpp
index e902d60c7..e79a681a6 100644
--- a/frame/item/stretchitem.cpp
+++ b/frame/item/stretchitem.cpp
@@ -3,7 +3,7 @@
 #include <QPaintEvent>
 
 StretchItem::StretchItem(QWidget *parent)
-    : DockItem(Stretch, parent)
+    : DockItem(parent)
 {
     setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 }
diff --git a/frame/item/stretchitem.h b/frame/item/stretchitem.h
index 788570be7..04d15b122 100644
--- a/frame/item/stretchitem.h
+++ b/frame/item/stretchitem.h
@@ -10,6 +10,8 @@ class StretchItem : public DockItem
 public:
     explicit StretchItem(QWidget *parent = 0);
 
+    inline ItemType itemType() const {return Stretch;}
+
 private:
     void mousePressEvent(QMouseEvent *e);
 };