diff --git a/ArchitectureColoredPainting/src/Editor/PreviewWindow.cpp b/ArchitectureColoredPainting/src/Editor/PreviewWindow.cpp
index 082ac27..0db3c48 100644
--- a/ArchitectureColoredPainting/src/Editor/PreviewWindow.cpp
+++ b/ArchitectureColoredPainting/src/Editor/PreviewWindow.cpp
@@ -2,7 +2,7 @@
 
 PreviewWindow::PreviewWindow(QWidget *parent) : QOpenGLWidget(parent)
 {
-    this->renderer = new Renderer::ElementRenderer(this);
+    this->renderer = Renderer::ElementRenderer::instance();
     QSurfaceFormat surfaceFormat;
     surfaceFormat.setSamples(16);
     setFormat(surfaceFormat);
diff --git a/ArchitectureColoredPainting/src/Renderer/Preview/ElementRenderer.cpp b/ArchitectureColoredPainting/src/Renderer/Preview/ElementRenderer.cpp
index 46bbb40..60a3b81 100644
--- a/ArchitectureColoredPainting/src/Renderer/Preview/ElementRenderer.cpp
+++ b/ArchitectureColoredPainting/src/Renderer/Preview/ElementRenderer.cpp
@@ -114,8 +114,7 @@ QRectF calcBoundingRect(const QPainterPath& path, const std::vector<BaseStyle>&
 	return QRectF(QPointF(leftTop.x, leftTop.y), QPointF(rightBottom.x, rightBottom.y));
 }
 
-Renderer::ElementRenderer::ElementRenderer(QOpenGLWidget* glWidget)
-	: glWidget(glWidget)
+Renderer::ElementRenderer::ElementRenderer()
 {
 	surface.create();
 	thread = std::jthread([&] {
@@ -181,6 +180,12 @@ Renderer::ElementRenderer::ElementRenderer(QOpenGLWidget* glWidget)
 		std::this_thread::yield();
 }
 
+ElementRenderer* Renderer::ElementRenderer::instance()
+{
+	static ElementRenderer renderer;
+	return &renderer;
+}
+
 std::pair<QImage, QPointF> Renderer::ElementRenderer::drawElement(const QPainterPath& path, const ElementStyle& style, float pixelRatio)
 {
 	std::unique_lock<std::mutex> lock(drawMutex);
diff --git a/ArchitectureColoredPainting/src/Renderer/Preview/ElementRenderer.h b/ArchitectureColoredPainting/src/Renderer/Preview/ElementRenderer.h
index c2f10b9..9c59db5 100644
--- a/ArchitectureColoredPainting/src/Renderer/Preview/ElementRenderer.h
+++ b/ArchitectureColoredPainting/src/Renderer/Preview/ElementRenderer.h
@@ -10,7 +10,7 @@ namespace Renderer
 	class ElementRenderer : protected QOpenGLFunctions_4_5_Core
 	{
 	public:
-		ElementRenderer(QOpenGLWidget* glWidget);
+		static ElementRenderer* instance();
 
 		/**
 		 * @brief ½«Í¼Ôª»æÖƵ½QImage
@@ -22,7 +22,6 @@ namespace Renderer
 		 */
 		std::pair<QImage, QPointF> drawElement(const QPainterPath& path, const ElementStyle& style, float pixelRatio);
 	protected:
-		QOpenGLWidget* glWidget;
 		std::unique_ptr<QOpenGLShaderProgram> shader;
 		std::jthread thread;
 		QOffscreenSurface surface;
@@ -36,6 +35,8 @@ namespace Renderer
 		const ElementStyle* style;
 		float pixelRatio;
 		std::pair<QImage, QPointF> result;
+
+		ElementRenderer();
 	};
 
 }
diff --git a/UnitTest/ElementRendererTest.h b/UnitTest/ElementRendererTest.h
index 5c1e12c..9271821 100644
--- a/UnitTest/ElementRendererTest.h
+++ b/UnitTest/ElementRendererTest.h
@@ -14,11 +14,11 @@ namespace UnitTest
 	{
 		Q_OBJECT
 	private:
-		Renderer::ElementRenderer renderer;
+		Renderer::ElementRenderer& renderer;
 		Renderer::ElementStyle& style;
 	public:
 		TestGLWidget(Renderer::ElementStyle& style, QWidget* parent = nullptr)
-			: QOpenGLWidget(parent), renderer(this), style(style) {};
+			: QOpenGLWidget(parent), renderer(*Renderer::ElementRenderer::instance()), style(style) {};
 		void initializeGL() override
 		{
 			initializeOpenGLFunctions();