diff --git a/graph_implement.cpp b/graph_implement.cpp
index 76e1ff8..2eec664 100644
--- a/graph_implement.cpp
+++ b/graph_implement.cpp
@@ -230,7 +230,7 @@ void ALGraph::ResetDistance(){
     }
 }
 
-void ALGraph::DFS(int strtID){
+void ALGraph::DFS(int strtID, bool generateForest){
     if(strtID == -1)
         return;
     vector<int> awaitVexList;
@@ -254,9 +254,35 @@ void ALGraph::DFS(int strtID){
             nextArc->visit();
         vexList[nextVex].visit();
     }
+    if(generateForest){
+        for(int i = 0; i < vexList.size(); i++){
+            if(vexList[i].visited)  continue;
+            awaitVexList.clear();
+            awaitArcList.clear();
+            awaitVexList.push_back(i);
+            while(awaitVexList.size() > 0){
+                int nextVex = awaitVexList.back();
+                ALArc *nextArc = awaitArcList.size() > 0 ? awaitArcList.back() : nullptr;
+                awaitVexList.pop_back();
+                if(nextArc)
+                    awaitArcList.pop_back();
+                for(ALArc *p = vexList[nextVex].firstArc; p != nullptr; p = p->nextArc){
+                    if(vexList[p->eVexID].visited == false){
+                        awaitVexList.push_back(p->eVexID);
+                        awaitArcList.push_back(p);
+                        if(type == UDG && GetIdOf(p->gArc->edVex()) != p->eVexID)
+                            p->gArc->reverseDirection();
+                    }
+                }
+                if(nextArc && !vexList[nextArc->eVexID].visited)
+                    nextArc->visit();
+                vexList[nextVex].visit();
+            }
+        }
+    }
 }
 
-void ALGraph::BFS(int strtID){
+void ALGraph::BFS(int strtID, bool generateForest){
     if(strtID == -1)
         return;
     vector<int> awaitVexList;
@@ -280,6 +306,32 @@ void ALGraph::BFS(int strtID){
             nextArc->visit();
         vexList[nextVex].visit();
     }
+    if(generateForest){
+        for(int i = 0; i < vexList.size(); i++){
+            if(vexList[i].visited)  continue;
+            awaitVexList.clear();
+            awaitArcList.clear();
+            awaitVexList.push_back(i);
+            while(awaitVexList.size() > 0){
+                int nextVex = awaitVexList[0];
+                ALArc *nextArc = awaitArcList.size() > 0 ? awaitArcList[0] : nullptr;
+                awaitVexList.erase(awaitVexList.begin());
+                if(nextArc)
+                    awaitArcList.erase(awaitArcList.begin());
+                for(ALArc *p = vexList[nextVex].firstArc; p != nullptr; p = p->nextArc){
+                    if(vexList[p->eVexID].visited == false){
+                        awaitVexList.push_back(p->eVexID);
+                        awaitArcList.push_back(p);
+                        if(type == UDG && GetIdOf(p->gArc->edVex()) != p->eVexID)
+                            p->gArc->reverseDirection();
+                    }
+                }
+                if(nextArc && !vexList[nextArc->eVexID].visited)
+                    nextArc->visit();
+                vexList[nextVex].visit();
+            }
+        }
+    }
 }
 
 void ALGraph::Dijkstra(int strtID){
@@ -795,7 +847,7 @@ void AMLGraph::ResetDistance(){
         }
 }
 
-void AMLGraph::DFS(int strtID){
+void AMLGraph::DFS(int strtID, bool generateForest){
     if(strtID == -1)
         return;
     vector<int> awaitVexList;
@@ -820,9 +872,36 @@ void AMLGraph::DFS(int strtID){
             nextArc->visit();
         outVexList[nextVex].visit();
     }
+    if(generateForest){
+        for(int i = 0; i < outVexList.size(); i++){
+            if(outVexList[i].visited)   continue;
+            awaitVexList.clear();
+            awaitArcList.clear();
+            awaitVexList.push_back(i);
+            while(awaitVexList.size() > 0){
+                int nextVex = awaitVexList.back();
+                AMLArc *nextArc = awaitArcList.size() > 0 ? awaitArcList.back() : nullptr;
+                awaitVexList.pop_back();
+                if(nextArc)
+                    awaitArcList.pop_back();
+                for(AMLArc *p = outVexList[nextVex].firstArc; p != nullptr; p = p->outVexID == strtID ? p->nextOutArc : p->nextInArc){
+                    int endID = p->outVexID == nextVex ? p->inVexID : p->outVexID;
+                    if(outVexList[endID].visited == false){
+                        awaitVexList.push_back(endID);
+                        awaitArcList.push_back(p);
+                        if(type == UDG && GetIdOf(p->gArc->edVex()) != endID)
+                            p->gArc->reverseDirection();
+                    }
+                }
+                if(nextArc && !outVexList[nextVex].visited)
+                    nextArc->visit();
+                outVexList[nextVex].visit();
+            }
+        }
+    }
 }
 
-void AMLGraph::BFS(int strtID){
+void AMLGraph::BFS(int strtID, bool generateForest){
     if(strtID == -1)
         return;
     vector<int> awaitVexList;
@@ -847,6 +926,33 @@ void AMLGraph::BFS(int strtID){
             nextArc->visit();
         outVexList[nextVex].visit();
     }
+    if(generateForest){
+        for(int i = 0; i < outVexList.size(); i++){
+            if(outVexList[i].visited)   continue;
+            awaitVexList.clear();
+            awaitArcList.clear();
+            awaitVexList.push_back(i);
+            while(awaitVexList.size() > 0){
+                int nextVex = awaitVexList[0];
+                AMLArc *nextArc = awaitArcList.size() > 0 ? awaitArcList[0] : nullptr;
+                awaitVexList.erase(awaitVexList.begin());
+                if(nextArc)
+                    awaitArcList.erase(awaitArcList.begin());
+                for(AMLArc *p = outVexList[nextVex].firstArc; p != nullptr; p = p->outVexID == strtID ? p->nextOutArc : p->nextInArc){
+                    int endID = p->outVexID == nextVex ? p->inVexID : p->outVexID;
+                    if(outVexList[endID].visited == false){
+                        awaitVexList.push_back(endID);
+                        awaitArcList.push_back(p);
+                        if(type == UDG && GetIdOf(p->gArc->edVex()) != endID)
+                            p->gArc->reverseDirection();
+                    }
+                }
+                if(nextArc && !outVexList[nextVex].visited)
+                    nextArc->visit();
+                outVexList[nextVex].visit();
+            }
+        }
+    }
 }
 
 void AMLGraph::Dijkstra(int strtID){
diff --git a/graph_implement.h b/graph_implement.h
index e5cbc95..a342354 100644
--- a/graph_implement.h
+++ b/graph_implement.h
@@ -50,10 +50,10 @@ public:
     /* Other Function */
     virtual void ClearVisit() = 0;
     virtual void ResetDistance() = 0;
-    virtual void DFS(int strtID) = 0;
-    virtual void DFS(MyGraphicsVexItem *strtVex) = 0;
-    virtual void BFS(int strtID) = 0;
-    virtual void BFS(MyGraphicsVexItem *strtVex) = 0;
+    virtual void DFS(int strtID, bool generateForest = false) = 0;
+    virtual void DFS(MyGraphicsVexItem *strtVex, bool generateForest = false) = 0;
+    virtual void BFS(int strtID, bool generateForest = false) = 0;
+    virtual void BFS(MyGraphicsVexItem *strtVex, bool generateForest = false) = 0;
     virtual void Dijkstra(int strtID) = 0;
     virtual void Dijkstra(MyGraphicsVexItem *strtVex) = 0;
 
@@ -127,10 +127,10 @@ public:
     /* Other Function */
     void ClearVisit();
     void ResetDistance();
-    void DFS(int strtID);
-    void DFS(MyGraphicsVexItem *strtVex){DFS(GetIdOf(strtVex));}
-    void BFS(int strtID);
-    void BFS(MyGraphicsVexItem *strtVex){BFS(GetIdOf(strtVex));}
+    void DFS(int strtID, bool generateForest = false);
+    void DFS(MyGraphicsVexItem *strtVex, bool generateForest = false){DFS(GetIdOf(strtVex), generateForest);}
+    void BFS(int strtID, bool generateForest = false);
+    void BFS(MyGraphicsVexItem *strtVex, bool generateForest = false){BFS(GetIdOf(strtVex), generateForest);}
     void Dijkstra(int strtID);
     void Dijkstra(MyGraphicsVexItem *strtVex){Dijkstra(GetIdOf(strtVex));}
     AMLGraph* ConvertToAML();
@@ -202,10 +202,10 @@ public:
     /* Other Function */
     void ClearVisit();
     void ResetDistance();
-    void DFS(int strtID);
-    void DFS(MyGraphicsVexItem *strtVex){DFS(GetIdOf(strtVex));}
-    void BFS(int strtID);
-    void BFS(MyGraphicsVexItem *strtVex){BFS(GetIdOf(strtVex));}
+    void DFS(int strtID, bool generateForest = false);
+    void DFS(MyGraphicsVexItem *strtVex, bool generateForest = false){DFS(GetIdOf(strtVex), generateForest);}
+    void BFS(int strtID, bool generateForest = false);
+    void BFS(MyGraphicsVexItem *strtVex, bool generateForest = false){BFS(GetIdOf(strtVex), generateForest);}
     void Dijkstra(int strtID);
     void Dijkstra(MyGraphicsVexItem *strtVex){Dijkstra(GetIdOf(strtVex));}
     ALGraph* ConvertToAL();
diff --git a/mycanvas.cpp b/mycanvas.cpp
index 7a6e6a3..e44d123 100644
--- a/mycanvas.cpp
+++ b/mycanvas.cpp
@@ -89,6 +89,14 @@ void MyCanvas::CreateSettings(int radius){
         view->setType(id == 0 ? MyGraphicsView::DG : MyGraphicsView::UDG);
         type = id == 0 ? DG : UDG;
     });
+    singleSelectGroup *dfsSetting = new singleSelectGroup("Traverse Mode", this);
+    selectionItem *setGenerateTree = new selectionItem("Tree", "Generate tree", this);
+    selectionItem *setGenerateForest = new selectionItem("Forest", "Generate forest", this);
+    dfsSetting->AddItem(setGenerateTree);
+    dfsSetting->AddItem(setGenerateForest);
+    connect(dfsSetting, &singleSelectGroup::selectedItemChange, this, [=](int id){
+        generateForest = id == 1;
+    });
     QWidget *whiteSpace = new QWidget(this);
     whiteSpace->setFixedHeight(30);
     horizontalValueAdjuster *aniSpeed = new horizontalValueAdjuster("Animation speed", 0.1, 20, 0.1, this);
@@ -110,6 +118,7 @@ void MyCanvas::CreateSettings(int radius){
     connect(delBtn, &textButton::clicked, this, [=](){emit setDel(this);});
     settings->AddContent(delBtn);
     settings->AddContent(saveBtn);
+    settings->AddContent(dfsSetting);
     settings->AddContent(dirSetting);
     settings->AddContent(structureSetting);
     settings->AddContent(aniSpeed);
@@ -353,19 +362,22 @@ void MyCanvas::Init(){
         viewLog *newLog = new viewLog("[BFS] | --- BFS start ---");
         newLog->setStyleSheet("color:#0078d4");
         logDisplay->addWidget(newLog);
-        bfs();
+        g->BFS(view->selectedVex(), generateForest);
+        view->hasVisitedItem = true;
     });
     connect(startDfs, &textButton::clicked, this, [=](){
         viewLog *newLog = new viewLog("[DFS] | --- DFS start ---");
         newLog->setStyleSheet("color:#0078d4");
         logDisplay->addWidget(newLog);
-        dfs();
+        g->DFS(view->selectedVex(), generateForest);
+        view->hasVisitedItem = true;
     });
     connect(startDij, &textButton::clicked, this, [=](){
         viewLog *newLog = new viewLog("[Dij] | --- Dijkstra start ---");
         newLog->setStyleSheet("color:#0078d4");
         logDisplay->addWidget(newLog);
-        dijkstra();
+        g->Dijkstra(view->selectedVex());
+        view->hasVisitedItem = true;
         if(g->GetInfoOf(view->selectedVex())->strtVexInfo == nullptr){
             dijStart->setValue("Run dijkstra first");
             dijPrev->setValue("Run dijkstra first");
@@ -429,34 +441,3 @@ void MyCanvas::addVex(MyGraphicsVexItem *vex){
 void MyCanvas::addArc(MyGraphicsLineItem *arc){
     g->AddArc(arc);
 }
-
-void MyCanvas::dfs(){
-    MyGraphicsVexItem *strtVex = view->selectedVex();
-    if(strtVex != nullptr){
-        g->DFS(strtVex);
-        view->hasVisitedItem = true;
-    }
-}
-
-void MyCanvas::bfs(){
-    MyGraphicsVexItem *strtVex = view->selectedVex();
-    if(strtVex != nullptr){
-        g->BFS(strtVex);
-        view->hasVisitedItem = true;
-    }
-}
-
-void MyCanvas::dijkstra(){
-    MyGraphicsVexItem *strtVex = view->selectedVex();
-    if(strtVex){
-        g->Dijkstra(strtVex);
-        view->hasVisitedItem = true;
-    }
-}
-
-void MyCanvas::setWeight(int w){
-    MyGraphicsLineItem *arc = view->selectedArc();
-    if(arc){
-        g->SetWeight(arc, w);
-    }
-}
diff --git a/mycanvas.h b/mycanvas.h
index 82fca79..8377378 100644
--- a/mycanvas.h
+++ b/mycanvas.h
@@ -25,6 +25,7 @@ private:
     AbstractGraph *g;
     int structure_type;
     int type;
+    bool generateForest = false;
 
     void CreateSettings(int r);
     void Init();
@@ -48,13 +49,6 @@ signals:
 private slots:
     void addVex(MyGraphicsVexItem*);
     void addArc(MyGraphicsLineItem*);
-    //void delVex(MyGraphicsVexItem*);
-    //void delArc(MyGraphicsLineItem*);
-    void dfs();
-    void bfs();
-    void dijkstra();
-    void setWeight(int w);
-    void setAniRate(int step){view->setAniRate(step / 100.0);}
 
 };