diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 2532f607..440ccaa7 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -175,6 +175,12 @@ MainWindow::MainWindow()
     QAction *markAsTrunkAct = new QAction(tr("Mark as &Trunk"), this);
     connect(markAsTrunkAct, &QAction::triggered, skeletonWidget->graphicsView(), &SkeletonEditGraphicsView::markAsTrunk);
     
+    QAction *markAsRootAct = new QAction(tr("Mark as &Root"), this);
+    connect(markAsRootAct, &QAction::triggered, skeletonWidget->graphicsView(), &SkeletonEditGraphicsView::markAsRoot);
+    
+    QAction *markAsChildAct = new QAction(tr("Mark as &Child"), this);
+    connect(markAsChildAct, &QAction::triggered, skeletonWidget->graphicsView(), &SkeletonEditGraphicsView::markAsChild);
+    
     QAction *changeTurnaroundAct = new QAction(tr("&Change Turnaround..."), this);
     connect(changeTurnaroundAct, &QAction::triggered, skeletonWidget, &SkeletonWidget::changeTurnaround);
     
@@ -196,6 +202,9 @@ MainWindow::MainWindow()
     editMenu->addAction(markAsBranchAct);
     editMenu->addAction(markAsTrunkAct);
     editMenu->addSeparator();
+    editMenu->addAction(markAsRootAct);
+    editMenu->addAction(markAsChildAct);
+    editMenu->addSeparator();
     editMenu->addAction(changeTurnaroundAct);
     
     bool connectResult = false;
diff --git a/src/skeletoneditgraphicsview.cpp b/src/skeletoneditgraphicsview.cpp
index 1649ff9d..c02cdeda 100644
--- a/src/skeletoneditgraphicsview.cpp
+++ b/src/skeletoneditgraphicsview.cpp
@@ -545,6 +545,7 @@ void SkeletonEditGraphicsView::saveToSnapshot(SkeletonSnapshot *snapshot)
             (*snapshotNode)["sideColorName"] = nodeItem->sideColorName();
             (*snapshotNode)["radius"] = QString("%1").arg(nodeItem->radius());
             (*snapshotNode)["isBranch"] = QString("%1").arg(nodeItem->isBranch() ? "true" : "false");
+            (*snapshotNode)["isRoot"] = QString("%1").arg(nodeItem->isRoot() ? "true" : "false");
             QPointF origin = nodeItem->origin();
             (*snapshotNode)["x"] = QString("%1").arg(origin.x());
             (*snapshotNode)["y"] = QString("%1").arg(origin.y());
@@ -593,3 +594,21 @@ void SkeletonEditGraphicsView::markAsTrunk()
         emit nodesChanged();
     }
 }
+
+void SkeletonEditGraphicsView::markAsRoot()
+{
+    if (m_nextStartNodeItem) {
+        m_nextStartNodeItem->markAsRoot(true);
+        m_nextStartNodeItem->nextSidePair()->markAsRoot(true);
+        emit nodesChanged();
+    }
+}
+
+void SkeletonEditGraphicsView::markAsChild()
+{
+    if (m_nextStartNodeItem) {
+        m_nextStartNodeItem->markAsRoot(false);
+        m_nextStartNodeItem->nextSidePair()->markAsRoot(false);
+        emit nodesChanged();
+    }
+}
diff --git a/src/skeletoneditgraphicsview.h b/src/skeletoneditgraphicsview.h
index cd5e8206..3d9942e9 100644
--- a/src/skeletoneditgraphicsview.h
+++ b/src/skeletoneditgraphicsview.h
@@ -22,6 +22,8 @@ public slots:
     void turnOnAddNodeMode();
     void markAsBranch();
     void markAsTrunk();
+    void markAsRoot();
+    void markAsChild();
 public:
     SkeletonEditGraphicsView(QWidget *parent = 0);
     void updateBackgroundImage(const QImage &image);
diff --git a/src/skeletoneditnodeitem.cpp b/src/skeletoneditnodeitem.cpp
index 3b6225a8..a71ddb33 100644
--- a/src/skeletoneditnodeitem.cpp
+++ b/src/skeletoneditnodeitem.cpp
@@ -9,7 +9,8 @@ SkeletonEditNodeItem::SkeletonEditNodeItem(const QRectF &rect, QGraphicsItem *pa
     m_nextSidePair(NULL),
     m_sideColor(Theme::red),
     m_sideColorName("red"),
-    m_isBranch(false)
+    m_isBranch(false),
+    m_isRoot(false)
 {
     setData(0, "node");
     updateAppearance();
@@ -26,6 +27,17 @@ bool SkeletonEditNodeItem::isBranch()
     return m_isBranch;
 }
 
+void SkeletonEditNodeItem::markAsRoot(bool isRoot)
+{
+    m_isRoot = isRoot;
+    updateAppearance();
+}
+
+bool SkeletonEditNodeItem::isRoot()
+{
+    return m_isRoot;
+}
+
 const QString &SkeletonEditNodeItem::sideColorName()
 {
     return m_sideColorName;
@@ -112,7 +124,7 @@ void SkeletonEditNodeItem::updateAppearance()
     QColor penColor = m_sideColor;
     penColor.setAlphaF(m_checked ? Theme::checkedAlpha : (m_isBranch ? Theme::branchAlpha : Theme::normalAlpha));
     QPen pen(penColor);
-    pen.setWidth(Theme::skeletonNodeBorderSize);
+    pen.setWidth(m_isRoot ? Theme::skeletonNodeBorderSize : (Theme::skeletonNodeBorderSize * 2));
     setPen(pen);
     
     QColor brushColor = m_sideColor;
diff --git a/src/skeletoneditnodeitem.h b/src/skeletoneditnodeitem.h
index 8bb25bb9..7f97a168 100644
--- a/src/skeletoneditnodeitem.h
+++ b/src/skeletoneditnodeitem.h
@@ -21,6 +21,8 @@ public:
     void setChecked(bool checked);
     void markAsBranch(bool isBranch);
     bool isBranch();
+    void markAsRoot(bool isRoot);
+    bool isRoot();
     SkeletonEditNodeItem *nextSidePair();
     void setNextSidePair(SkeletonEditNodeItem *nodeItem);
     const QColor &sideColor();
@@ -35,6 +37,7 @@ private:
     QColor m_sideColor;
     QString m_sideColorName;
     bool m_isBranch;
+    bool m_isRoot;
 private:
     void updateAppearance();
 };
diff --git a/src/skeletonsnapshot.cpp b/src/skeletonsnapshot.cpp
index 8a2ff5b8..5357d403 100644
--- a/src/skeletonsnapshot.cpp
+++ b/src/skeletonsnapshot.cpp
@@ -257,6 +257,10 @@ void SkeletonSnapshot::resolveRootNode()
     for (nodeIterator = nodes.begin(); nodeIterator != nodes.end(); nodeIterator++) {
         if ("red" != nodeIterator->second["sideColorName"])
             continue;
+        if ("true" == nodeIterator->second["isRoot"]) {
+            m_rootNode = nodeIterator->first;
+            break;
+        }
         if (nodeNeighborCountMap[nodeIterator->first] < 3)
             continue;
         float radius = nodeIterator->second["radius"].toFloat();
diff --git a/src/skeletontomesh.cpp b/src/skeletontomesh.cpp
index 886effab..adf075ae 100644
--- a/src/skeletontomesh.cpp
+++ b/src/skeletontomesh.cpp
@@ -245,6 +245,11 @@ void SkeletonToMesh::process()
     std::vector<SkeletonSnapshot> groups;
     QRectF globalFront = m_snapshot.boundingBoxFront();
     QRectF globalSide = m_snapshot.boundingBoxSide();
+    QString rootNodeId = m_snapshot.rootNode();
+    printf("rootNodeId:%s\n", rootNodeId.toUtf8().constData());
+    float frontMiddleX = m_snapshot.nodes[rootNodeId]["x"].toFloat();
+    float frontMiddleY = m_snapshot.nodes[rootNodeId]["y"].toFloat();
+    float sideMiddleX = m_snapshot.nodes[m_snapshot.nodes[rootNodeId]["nextSidePair"]]["x"].toFloat();
     m_snapshot.splitByConnectivity(&groups);
     
     std::vector<int> meshIds;
@@ -266,9 +271,9 @@ void SkeletonToMesh::process()
             std::map<QString, std::map<QString, QString>>::iterator nextSidePair = skeleton->nodes.find(nodeIterator->second["nextSidePair"]);
             if (nextSidePair == skeleton->nodes.end())
                 continue;
-            float x = (nodeIterator->second["x"].toFloat() - globalFront.left()) / canvasHeight;
-            float y = (nodeIterator->second["y"].toFloat() - globalFront.top()) / canvasHeight;
-            float z = (nextSidePair->second["x"].toFloat() - globalSide.left()) / canvasHeight;
+            float x = (nodeIterator->second["x"].toFloat() - frontMiddleX) / canvasHeight;
+            float y = (nodeIterator->second["y"].toFloat() - frontMiddleY) / canvasHeight;
+            float z = (nextSidePair->second["x"].toFloat() - sideMiddleX) / canvasHeight;
             float r = nodeIterator->second["radius"].toFloat() / canvasHeight;
             float t = nextSidePair->second["radius"].toFloat() / canvasHeight;
             int bmeshNodeId = meshlite_bmesh_add_node(meshliteContext, bmeshId, x, y, z, r, t);