diff --git a/ArchitectureColoredPainting/src/Editor/EditorWidget.cpp b/ArchitectureColoredPainting/src/Editor/EditorWidget.cpp
index 3e5eff5..81d9f19 100644
--- a/ArchitectureColoredPainting/src/Editor/EditorWidget.cpp
+++ b/ArchitectureColoredPainting/src/Editor/EditorWidget.cpp
@@ -14,6 +14,8 @@ EditorWidget::EditorWidget(QWidget *parent) : QWidget(parent)
     connect(treeWidget, &LayerTreeWidget::displayLayerChange, this, &EditorWidget::onLayerChange);
     connect(layerInfoDisplayWidget, &InfoDisplayWidget::requireRefreshPreview, this,
             &EditorWidget::triggerRefreshPreview);
+    connect(treeWidget, &LayerTreeWidget::requireRefreshPreview, this,
+        &EditorWidget::triggerRefreshPreview);
 	connect(layerInfoDisplayWidget, &InfoDisplayWidget::requireSelfRefresh, layerInfoDisplayWidget, &InfoDisplayWidget::triggerSelfRefresh);
     // &EditorWidget::triggerRefreshPreview);
     //  test
@@ -32,7 +34,9 @@ EditorWidget::EditorWidget(QWidget *parent) : QWidget(parent)
     previewWindow->initialize(layerManager,QSize(jsonDoc.object().value("width").toDouble(),jsonDoc.object().value("height").toDouble()));
     if (layerManager->getRoot() != nullptr)
     {
-        treeWidget->addTopLevelItem(layerManager->getRoot()->qTreeItem);
+        treeWidget->root = layerManager->getRoot();
+		treeWidget->refresh();
+		treeWidget->addTopLevelItem(treeWidget->root->getQTreeItem());
     }
 }
 
diff --git a/ArchitectureColoredPainting/src/Editor/LayerManager.cpp b/ArchitectureColoredPainting/src/Editor/LayerManager.cpp
index 3634c10..5831180 100644
--- a/ArchitectureColoredPainting/src/Editor/LayerManager.cpp
+++ b/ArchitectureColoredPainting/src/Editor/LayerManager.cpp
@@ -48,7 +48,7 @@ bool LayerManager::combine() const
         if (layer->getParent() != prevCommonFather)
             return false;
     auto newCommonFather = new FolderLayerWrapper();
-    newCommonFather->setParent(prevCommonFather);
+    newCommonFather->setParent(static_cast<FolderLayerWrapper*>(prevCommonFather));
     for (auto &layer : selectedLayers)
         layer->setParent(newCommonFather);
     return true;
diff --git a/ArchitectureColoredPainting/src/Editor/LayerWrapper.cpp b/ArchitectureColoredPainting/src/Editor/LayerWrapper.cpp
index efd5de6..a8f0a07 100644
--- a/ArchitectureColoredPainting/src/Editor/LayerWrapper.cpp
+++ b/ArchitectureColoredPainting/src/Editor/LayerWrapper.cpp
@@ -1,11 +1,11 @@
 #include "LayerWrapper.h"
 using namespace std;
-void FolderLayerWrapper::addChild(LayerWrapper *child)
+void FolderLayerWrapper::addChild(shared_ptr<LayerWrapper> child)
 {
     for (auto &chi : children)
-        if (chi.get() == child)
+        if (chi == child)
             return;
-    children.push_back(shared_ptr<LayerWrapper>(child));
+    children.push_back(child);
 }
 
 void FolderLayerWrapper::removeChild(LayerWrapper *child)
@@ -18,9 +18,9 @@ void FolderLayerWrapper::removeChild(LayerWrapper *child)
         }
 }
 
-LayerWrapper *LayerWrapper::getParent() const
+FolderLayerWrapper*LayerWrapper::getParent() const
 {
-    return this == nullptr ? nullptr : this->parent.get();
+    return this == nullptr ? nullptr : this->parent;
 }
 
 PixelPath LayerWrapper::getCache()
@@ -30,9 +30,9 @@ PixelPath LayerWrapper::getCache()
 }
 
 // TODO: undone
-LayerWrapper::LayerWrapper(QJsonObject json, LayerWrapper *parent)
+LayerWrapper::LayerWrapper(QJsonObject json, FolderLayerWrapper*parent)
 {
-    this->parent = shared_ptr<LayerWrapper>(parent);
+    this->parent = parent;
     auto transformJson = json.value("transform").toObject();
     property.name = json.value("name").toString();
     property.offset = {transformJson.value("offset").toObject().value("x").toDouble(),
@@ -40,14 +40,9 @@ LayerWrapper::LayerWrapper(QJsonObject json, LayerWrapper *parent)
     property.scale = {transformJson.value("scale").toObject().value("x").toDouble(),
                       transformJson.value("scale").toObject().value("y").toDouble()};
     property.rotation = {transformJson.value("rotation").toDouble()};
-    qTreeItem = new QTreeWidgetItem();
-    qTreeItem->setText(0, property.name);
-    if (parent != nullptr)
-        parent->qTreeItem->addChild(qTreeItem);
-    qTreeItem->setData(0, Qt::UserRole, QVariant::fromValue(this));
 }
 
-FolderLayerWrapper::FolderLayerWrapper(QJsonObject json, ElementManager *elementManager, LayerWrapper *parent)
+FolderLayerWrapper::FolderLayerWrapper(QJsonObject json, ElementManager *elementManager, FolderLayerWrapper*parent)
     : LayerWrapper(json, parent)
 {
     qDebug() << json.value("name").toString() << "    " << this;
@@ -70,7 +65,7 @@ FolderLayerWrapper::FolderLayerWrapper(QJsonObject json, ElementManager *element
     }
 }
 
-LeafLayerWrapper::LeafLayerWrapper(QJsonObject json, ElementManager *elementManager, LayerWrapper *parent)
+LeafLayerWrapper::LeafLayerWrapper(QJsonObject json, ElementManager *elementManager, FolderLayerWrapper*parent)
     : LayerWrapper(json, parent)
 {
     qDebug() << json.value("name").toString() << "    " << this;
@@ -99,8 +94,10 @@ void LayerWrapper::refresh()
 void FolderLayerWrapper::refresh()
 {
     cache.clear();
-    for (auto &child : children)
+    for (auto& child : children) {
+        qDebug() << child.get();
         cache.addPath(child.get()->getCache());
+    }
     LayerWrapper::refresh();
 }
 
@@ -114,21 +111,73 @@ void LeafLayerWrapper::refresh()
     LayerWrapper::refresh();
 }
 
-void LayerWrapper::setParent(LayerWrapper *newParent)
+void LayerWrapper::setParent(FolderLayerWrapper* newParent)
 {
-    this->parent = shared_ptr<LayerWrapper>(newParent);
+    this->parent = newParent;
 }
 
 void FolderLayerWrapper::removeAllChild()
 {
     children.clear();
+	qTreeWidgetItem.takeChildren();
 }
 
-namespace LayerEvent
-{
-
-static void onDoubleClick(QTreeWidgetItem *qItem, LayerWrapper *layerWrapper)
-{
+void LayerWrapper::del() {
+    qDebug() << "LayerWrapper::del()";
+	if (parent != nullptr){
+        qTreeWidgetItem.takeChildren();
+		parent->qTreeWidgetItem.removeChild(&qTreeWidgetItem);
+    }
 }
 
-} // namespace LayerEvent
+void LayerWrapper::delSelf() {
+    qDebug() << "LayerWrapper::delSelf()";
+    if (parent != nullptr) {
+        qTreeWidgetItem.takeChildren();
+        parent->qTreeWidgetItem.removeChild(&qTreeWidgetItem);
+    }
+}
+
+void FolderLayerWrapper::del()
+{
+    qDebug() << "FolderLayerWrapper::del()";
+	for (auto& child : children)
+		child->del();
+	LayerWrapper::del();
+}
+
+void FolderLayerWrapper::delSelf() {
+    qDebug() << "FolderLayerWrapper::delSelf()   "<<this<<"  "<<this->parent;
+    LayerWrapper::delSelf();
+    if (parent != nullptr) {
+		qDebug() << this->children.size();
+        qDebug() << this;
+        for (auto& child : this->children) {
+			this->parent->addChild(child);
+			this->parent->qTreeWidgetItem.addChild(&child.get()->qTreeWidgetItem);
+			child->setParent(this->parent);
+        }
+		while (!this->children.empty()) {
+			this->children.pop_back();
+		}
+    }
+
+}
+
+QTreeWidgetItem* LayerWrapper::getQTreeItem() 
+{
+	this->qTreeWidgetItem.setText(0, this->property.name);
+	this->qTreeWidgetItem.setData(0, Qt::UserRole, QVariant::fromValue(this));
+	return &this->qTreeWidgetItem;
+}
+
+QTreeWidgetItem* FolderLayerWrapper::getQTreeItem()
+{
+	while (this->qTreeWidgetItem.childCount() > 0) {
+		this->qTreeWidgetItem.removeChild(this->qTreeWidgetItem.child(0));
+	}
+	for (auto& child : this->children) {
+		this->qTreeWidgetItem.addChild(child->getQTreeItem());
+	}
+	return LayerWrapper::getQTreeItem();
+}
diff --git a/ArchitectureColoredPainting/src/Editor/LayerWrapper.h b/ArchitectureColoredPainting/src/Editor/LayerWrapper.h
index ea90dd8..8d0284f 100644
--- a/ArchitectureColoredPainting/src/Editor/LayerWrapper.h
+++ b/ArchitectureColoredPainting/src/Editor/LayerWrapper.h
@@ -20,19 +20,20 @@ class GraphicElement;
 class SimpleElement;
 class GroupElement;
 class ElementManager;
+class FolderLayerWrapper;
 
 class LayerWrapper
 {
 
   protected:
-    shared_ptr<LayerWrapper> parent;
+    FolderLayerWrapper* parent;
     QPointF referencePoint;
     // vector<LayerStyle> styles;
     // TODO: 将cache移到子类，对Leaf用ComposedPainterPath，对Folder用FolderBitmapPath
     PixelPath cache;
 
   public:
-    QTreeWidgetItem *qTreeItem;
+	QTreeWidgetItem qTreeWidgetItem;
     struct SimpleProperty
     {
         QString name = "";
@@ -44,18 +45,22 @@ class LayerWrapper
         // TODO: 将QPainterPath改为BitmapPath
         void apply(PixelPath&cache) const;
     } property;
-    void setParent(LayerWrapper *newParent);
+    virtual void setParent(FolderLayerWrapper*newParent);
     virtual void refresh();
+    virtual QTreeWidgetItem* getQTreeItem();
     // TODO: 将QPainterPath改为BitmapPath/QImage，或者直接将其删除，绘制时直接使用BitmapPath的paint方法
     virtual PixelPath getCache();
-    LayerWrapper *getParent() const; // invoke by manager, then invoke parent's applyStyles
-    LayerWrapper(QJsonObject json, LayerWrapper *parent);
+    FolderLayerWrapper*getParent() const; // invoke by manager, then invoke parent's applyStyles
+    LayerWrapper(QJsonObject json, FolderLayerWrapper*parent);
     LayerWrapper() = default;
     // TODO : export Function
     // virtual LayerWrapper *addChild() = 0;  // Leaf Child Only
     // virtual LayerWrapper *addParent() = 0; // Folder Parent Only
     // virtual void deleteSelf() const = 0;
     // virtual void deleteAll() const = 0;
+    virtual void del();
+    virtual void delSelf();
+    ~LayerWrapper() = default;
 };
 
 class FolderLayerWrapper : public LayerWrapper
@@ -64,12 +69,17 @@ class FolderLayerWrapper : public LayerWrapper
     vector<shared_ptr<LayerWrapper>> children;
 
   public:
+
+      ~FolderLayerWrapper() = default;
     void refresh() override;
     FolderLayerWrapper() = default;
-    FolderLayerWrapper(QJsonObject json, ElementManager *elementManager, LayerWrapper *parent);
-    void addChild(LayerWrapper *child);
+    FolderLayerWrapper(QJsonObject json, ElementManager *elementManager, FolderLayerWrapper*parent);
+    void addChild(shared_ptr<LayerWrapper> child);
     void removeChild(LayerWrapper *child);
     void removeAllChild();
+	void del() override;
+    void delSelf() override;
+	QTreeWidgetItem* getQTreeItem() override;
 };
 
 class LeafLayerWrapper : public LayerWrapper
@@ -79,9 +89,12 @@ class LeafLayerWrapper : public LayerWrapper
     const vector<Renderer::ElementStyleStrokeDemo> styles;
 
   public:
+	  ~LeafLayerWrapper() = default;
     void refresh() override;
     LeafLayerWrapper() = default;
-    LeafLayerWrapper(QJsonObject json, ElementManager *elementManager, LayerWrapper *parent);
+    LeafLayerWrapper(QJsonObject json, ElementManager *elementManager, FolderLayerWrapper*parent);
 };
 
 Q_DECLARE_METATYPE(LayerWrapper *)
+Q_DECLARE_METATYPE(FolderLayerWrapper *)
+Q_DECLARE_METATYPE(LeafLayerWrapper *)
diff --git a/ArchitectureColoredPainting/src/Editor/PixelPath.cpp b/ArchitectureColoredPainting/src/Editor/PixelPath.cpp
index bb36fcd..936b280 100644
--- a/ArchitectureColoredPainting/src/Editor/PixelPath.cpp
+++ b/ArchitectureColoredPainting/src/Editor/PixelPath.cpp
@@ -26,7 +26,6 @@ QPixmap PixelPath::getPixmap() const
 {
 	auto k = pixmap;
 	QPainter pt(&k);
-	qDebug() << this->boundingRect;
 	//pt.fillRect(this->boundingRect, Qt::red);
 	//pt.fillRect(QRectF(1013.35 - 1000, 768.327 - 700,58.0887,41.5352), Qt::blue);
 	return k;
diff --git a/ArchitectureColoredPainting/src/Editor/RightBar/LayerTreeWidget.cpp b/ArchitectureColoredPainting/src/Editor/RightBar/LayerTreeWidget.cpp
index bb59b9b..7ee7083 100644
--- a/ArchitectureColoredPainting/src/Editor/RightBar/LayerTreeWidget.cpp
+++ b/ArchitectureColoredPainting/src/Editor/RightBar/LayerTreeWidget.cpp
@@ -11,7 +11,10 @@ LayerTreeWidget::LayerTreeWidget(QWidget *parent)
     connect(this, &QTreeWidget::customContextMenuRequested, this, &LayerTreeWidget::popMenu);
     connect(this, &QTreeWidget::currentItemChanged, [=](QTreeWidgetItem *currentItem) {
         this->selectedItem = currentItem;
-        emit displayLayerChange(this->selectedItem->data(0, Qt::UserRole).value<LayerWrapper *>());
+		if(this->selectedItem !=nullptr)
+            emit displayLayerChange(this->selectedItem->data(0, Qt::UserRole).value<LayerWrapper *>());
+        else
+			emit displayLayerChange(nullptr);
     });
     // connect(this, &QTreeWidget::itemDoubleClicked, this, &LayerTreeWidget::onItemDoubleClicked);
 }
@@ -26,19 +29,33 @@ LayerTreeWidget::LayerTreeWidget(QWidget *parent)
 //     this->selectedItem = item;
 //     // TODO
 // }
-
+#include <QDebug>
 void LayerTreeWidget::popMenu(const QPoint &pos)
 {
     QMenu menu;
     QTreeWidgetItem *item = itemAt(pos);
     this->selectedItem = item;
     // TODO
-    menu.addAction("Add Child", this, &LayerTreeWidget::onRenameEvent);
-    menu.addAction("Rename", this, &LayerTreeWidget::onRenameEvent);
-    menu.addAction("Copy", this, &LayerTreeWidget::onRenameEvent);
+    menu.addAction(QString::fromLocal8Bit("创建子节点"), this, &LayerTreeWidget::onRenameEvent);
+    menu.addAction(QString::fromLocal8Bit("重命名"), this, &LayerTreeWidget::onRenameEvent);
+   //  menu.addAction("Copy", this, &LayerTreeWidget::onRenameEvent);
     if (item != nullptr && item->childCount() > 0)
-        menu.addAction("Delete (Self Only)", this, &LayerTreeWidget::onRenameEvent);
-    menu.addAction("Delete", this, &LayerTreeWidget::onRenameEvent);
+        menu.addAction(QString::fromLocal8Bit("删除（保留子节点）"), this, [this]() {
+		        auto layer = this->selectedItem->data(0, Qt::UserRole).value<LayerWrapper*>();
+                layer->delSelf();
+                layer->getParent()->removeChild(layer);
+                this->refresh();
+                emit requireRefreshPreview();
+            });
+    menu.addAction(QString::fromLocal8Bit("删除"), this, [this]() {
+            if (this->selectedItem == nullptr)
+                return;
+            auto layer = this->selectedItem->data(0, Qt::UserRole).value<LayerWrapper*>();
+            layer->del();
+			layer->getParent()->removeChild(layer);
+            this->refresh();
+            emit requireRefreshPreview();
+        });
     menu.exec(mapToGlobal(pos));
 }
 
@@ -57,3 +74,11 @@ void LayerTreeWidget::onRenameEvent()
     }
     emit displayLayerChange(this->selectedItem->data(0, Qt::UserRole).value<LayerWrapper *>());
 }
+
+void LayerTreeWidget::refresh() {
+ //   if(this->root!=nullptr)
+	//{
+	//	this->clear();
+	//	this->addTopLevelItem(this->root->getQTreeItem());
+	//}
+}
\ No newline at end of file
diff --git a/ArchitectureColoredPainting/src/Editor/RightBar/LayerTreeWidget.h b/ArchitectureColoredPainting/src/Editor/RightBar/LayerTreeWidget.h
index e8510a1..e935371 100644
--- a/ArchitectureColoredPainting/src/Editor/RightBar/LayerTreeWidget.h
+++ b/ArchitectureColoredPainting/src/Editor/RightBar/LayerTreeWidget.h
@@ -10,12 +10,15 @@ class LayerTreeWidget : public QTreeWidget
     LayerWrapper *copiedItem;
 
   public:
+    LayerWrapper* root;
     LayerTreeWidget(QWidget *parent = nullptr);
     void onRenameEvent();
     void popMenu(const QPoint &pos);
+    void refresh();
     // void mouseDoubleClickEvent(QMouseEvent *event) override;
     // void onItemDoubleClicked(QTreeWidgetItem *item, int column = 0);
 
   signals:
     void displayLayerChange(LayerWrapper *);
+    void requireRefreshPreview();
 };
diff --git a/data.json b/data.json
index e8a7a0c..577f595 100644
--- a/data.json
+++ b/data.json
@@ -1,12 +1,12 @@
 {
   "height": 1080,
-  "width": 1920,
+  "width": 1080,
   "elements": [
     {
       "name": "ababa",
       "type": "svg-file",
       "data": {
-        "include": "./svg/12(1).svg"
+        "include": "./svg/2.svg"
       }
     },
     {
@@ -25,14 +25,85 @@
         "y": 0
       },
       "scale": {
-        "x": 0.5,
-        "y": 0.5
+        "x": 1.0,
+        "y": 1.0
       },
       "rotation": 0.0
     },
     "effects": [],
-    "is-folder": false,
-    "element": 0
+    "is-folder": true,
+    "referenced-by": null,
+    "children": [
+      {
+        "name": "GroupFolderExample",
+        "transform": {
+          "offset": {
+            "x": 50,
+            "y": 50
+          },
+          "scale": {
+            "x": 1.0,
+            "y": 1.0
+          },
+          "rotation": 0.0
+        },
+        "effects": [],
+        "is-folder": true,
+        "referenced-by": 1,
+        "children": [
+          {
+            "name": "Leaf1",
+            "transform": {
+              "offset": {
+                "x": 0,
+                "y": 0
+              },
+              "scale": {
+                "x": 1.0,
+                "y": 1.0
+              },
+              "rotation": 0.0
+            },
+            "effects": [],
+            "is-folder": false,
+            "element": 0
+          },
+          {
+            "name": "Leaf2",
+            "transform": {
+              "offset": {
+                "x": 150,
+                "y": 0
+              },
+              "scale": {
+                "x": 1.5,
+                "y": 1.5
+              },
+              "rotation": 0.0
+            },
+            "effects": [],
+            "is-folder": false,
+            "element": 0
+          }
+        ]
+      },
+      {
+        "name": "ReferencingGroupLayer",
+        "transform": {
+          "offset": {
+            "x": 100,
+            "y": 0
+          },
+          "scale": {
+            "x": 1,
+            "y": 1
+          },
+          "rotation": 45
+        },
+        "effects": [],
+        "is-folder": false,
+        "element": 1
+      }
+    ]
   }
-
-}
+}
\ No newline at end of file