diff --git a/languages/dust3d_zh_CN.ts b/languages/dust3d_zh_CN.ts
index 704f62b3..a2ea055f 100644
--- a/languages/dust3d_zh_CN.ts
+++ b/languages/dust3d_zh_CN.ts
@@ -366,6 +366,10 @@ Tips:
         <source>Paint brush</source>
         <translation>画刷</translation>
     </message>
+    <message>
+        <source>Toggle UV Check</source>
+        <translation>切换UV检查</translation>
+    </message>
 </context>
 <context>
     <name>ExportPreviewWidget</name>
diff --git a/resources.qrc b/resources.qrc
index bb041a06..ae107efc 100644
--- a/resources.qrc
+++ b/resources.qrc
@@ -20,6 +20,7 @@
     <file>resources/hexagon.png</file>
     <file>resources/heptagon.png</file>
     <file>resources/userdefined.png</file>
+    <file>resources/checkuv.png</file>
     <file>shaders/default.vert</file>
     <file>shaders/default.frag</file>
     <file>shaders/default.core.vert</file>
diff --git a/resources/checkuv.png b/resources/checkuv.png
new file mode 100644
index 00000000..26023dd4
Binary files /dev/null and b/resources/checkuv.png differ
diff --git a/src/documentwindow.cpp b/src/documentwindow.cpp
index 7553454b..b5db9a12 100644
--- a/src/documentwindow.cpp
+++ b/src/documentwindow.cpp
@@ -651,6 +651,12 @@ DocumentWindow::DocumentWindow() :
         m_modelRenderWidget->toggleWireframe();
     });
     m_viewMenu->addAction(m_toggleWireframeAction);
+    
+    m_toggleUvCheckAction = new QAction(tr("Toggle UV Check"), this);
+    connect(m_toggleUvCheckAction, &QAction::triggered, [=]() {
+        m_modelRenderWidget->toggleUvCheck();
+    });
+    m_viewMenu->addAction(m_toggleUvCheckAction);
 
     connect(m_viewMenu, &QMenu::aboutToShow, [=]() {
         m_resetModelWidgetPosAction->setEnabled(!isModelSitInVisibleArea(m_modelRenderWidget));
diff --git a/src/documentwindow.h b/src/documentwindow.h
index 339d9354..a7f5faec 100644
--- a/src/documentwindow.h
+++ b/src/documentwindow.h
@@ -154,6 +154,7 @@ private:
     QMenu *m_viewMenu;
     QAction *m_resetModelWidgetPosAction;
     QAction *m_toggleWireframeAction;
+    QAction *m_toggleUvCheckAction;
     QAction *m_showMotionsListAction;
     
     QMenu *m_windowMenu;
diff --git a/src/modelmeshbinder.cpp b/src/modelmeshbinder.cpp
index f8bbc2cb..061f41b3 100644
--- a/src/modelmeshbinder.cpp
+++ b/src/modelmeshbinder.cpp
@@ -32,6 +32,19 @@ void ModelMeshBinder::updateMesh(MeshLoader *mesh)
     }
 }
 
+void ModelMeshBinder::reloadMesh()
+{
+    MeshLoader *mesh = nullptr;
+    {
+        QMutexLocker lock(&m_newMeshMutex);
+        if (nullptr == m_mesh)
+            return;
+        mesh = new MeshLoader(*m_mesh);
+    }
+    if (nullptr != mesh)
+        updateMesh(mesh);
+}
+
 void ModelMeshBinder::initialize()
 {
     m_vaoTriangle.create();
@@ -63,8 +76,16 @@ void ModelMeshBinder::paint(ModelShaderProgram *program)
                 m_hasTexture = nullptr != m_mesh->textureImage();
                 delete m_texture;
                 m_texture = nullptr;
-                if (m_hasTexture)
-                    m_texture = new QOpenGLTexture(*m_mesh->textureImage());
+                if (m_hasTexture) {
+                    if (m_checkUvEnabled) {
+                        static QImage *s_checkUv = nullptr;
+                        if (nullptr == s_checkUv)
+                            s_checkUv = new QImage(":/resources/checkuv.png");
+                        m_texture = new QOpenGLTexture(*s_checkUv);
+                    } else {
+                        m_texture = new QOpenGLTexture(*m_mesh->textureImage());
+                    }
+                }
                 
                 m_hasNormalMap = nullptr != m_mesh->normalMapImage();
                 delete m_normalMap;
@@ -253,3 +274,18 @@ bool ModelMeshBinder::isWireframesVisible()
 {
     return m_showWireframes;
 }
+
+void ModelMeshBinder::enableCheckUv()
+{
+    m_checkUvEnabled = true;
+}
+
+void ModelMeshBinder::disableCheckUv()
+{
+    m_checkUvEnabled = false;
+}
+
+bool ModelMeshBinder::isCheckUvEnabled()
+{
+    return m_checkUvEnabled;
+}
diff --git a/src/modelmeshbinder.h b/src/modelmeshbinder.h
index 64cdc2f0..de4eb113 100644
--- a/src/modelmeshbinder.h
+++ b/src/modelmeshbinder.h
@@ -20,6 +20,10 @@ public:
     void showWireframes();
     void hideWireframes();
     bool isWireframesVisible();
+    void enableCheckUv();
+    void disableCheckUv();
+    bool isCheckUvEnabled();
+    void reloadMesh();
 private:
     MeshLoader *m_mesh = nullptr;
     MeshLoader *m_newMesh = nullptr;
@@ -37,6 +41,7 @@ private:
     bool m_hasAmbientOcclusionMap = false;
     QOpenGLTexture *m_metalnessRoughnessAmbientOcclusionMap = nullptr;
     bool m_toolEnabled = false;
+    bool m_checkUvEnabled = false;
 private:
     QOpenGLVertexArrayObject m_vaoTriangle;
     QOpenGLBuffer m_vboTriangle;
diff --git a/src/modelwidget.cpp b/src/modelwidget.cpp
index d0d2dc8c..3fc4f4ac 100644
--- a/src/modelwidget.cpp
+++ b/src/modelwidget.cpp
@@ -194,7 +194,6 @@ std::pair<QVector3D, QVector3D> ModelWidget::screenPositionToMouseRay(const QPoi
     auto viewPort = QRect(0, 0, width(), height());
     auto nearPosition = nearScreen.unproject(modelView, m_projection, viewPort);
     auto farPosition = farScreen.unproject(modelView, m_projection, viewPort);
-    qDebug() << "near:" << nearPosition << "far:" << farPosition << "x:" << x << "y:" << y;
     return std::make_pair(nearPosition, farPosition);
 }
 
@@ -207,6 +206,16 @@ void ModelWidget::toggleWireframe()
     update();
 }
 
+void ModelWidget::toggleUvCheck()
+{
+    if (m_meshBinder.isCheckUvEnabled())
+        m_meshBinder.disableCheckUv();
+    else
+        m_meshBinder.enableCheckUv();
+    m_meshBinder.reloadMesh();
+    update();
+}
+
 bool ModelWidget::inputMousePressEventFromOtherWidget(QMouseEvent *event)
 {
     bool shouldStartMove = false;
diff --git a/src/modelwidget.h b/src/modelwidget.h
index ddc964c7..c6baff80 100644
--- a/src/modelwidget.h
+++ b/src/modelwidget.h
@@ -33,6 +33,7 @@ public:
     void updateMesh(MeshLoader *mesh);
     void setGraphicsFunctions(SkeletonGraphicsFunctions *graphicsFunctions);
     void toggleWireframe();
+    void toggleUvCheck();
     void enableMove(bool enabled);
     void enableZoom(bool enabled);
     void enableMousePicking(bool enabled);
diff --git a/thirdparty/simpleuv/simpleuv/uvunwrapper.cpp b/thirdparty/simpleuv/simpleuv/uvunwrapper.cpp
index 48759258..1b63b809 100644
--- a/thirdparty/simpleuv/simpleuv/uvunwrapper.cpp
+++ b/thirdparty/simpleuv/simpleuv/uvunwrapper.cpp
@@ -83,7 +83,7 @@ void UvUnwrapper::splitPartitionToIslands(const std::vector<size_t> &group, std:
                     continue;
                 if (segmentByNormal) {
                     if (dotProduct(m_mesh.faceNormals[findOppositeFaceResult->second],
-                            m_mesh.faceNormals[index]) < m_segmentDotProductThreshold) {
+                            m_mesh.faceNormals[m_segmentPreferMorePieces ? indexInGroup : index]) < m_segmentDotProductThreshold) {
                         continue;
                     }
                 }
diff --git a/thirdparty/simpleuv/simpleuv/uvunwrapper.h b/thirdparty/simpleuv/simpleuv/uvunwrapper.h
index c6d37abb..c057a86f 100644
--- a/thirdparty/simpleuv/simpleuv/uvunwrapper.h
+++ b/thirdparty/simpleuv/simpleuv/uvunwrapper.h
@@ -60,6 +60,7 @@ private:
     float m_segmentDotProductThreshold = 0.00;
     float m_texelSizePerUnit = 1.0;
     float m_resultTextureSize = 0;
+    bool m_segmentPreferMorePieces = false;
 };
 
 }