diff --git a/example/Vulkan/DrawText.cpp b/example/Vulkan/DrawText.cpp
index 10bd2c3d..b6db78a5 100644
--- a/example/Vulkan/DrawText.cpp
+++ b/example/Vulkan/DrawText.cpp
@@ -1,7 +1,6 @@
 #include<hgl/type/StringList.h>
 #include<hgl/graph/font/TextRender.h>
 #include"VulkanAppFramework.h"
-#include<hgl/math/Math.h>
 
 using namespace hgl;
 using namespace hgl::graph;
@@ -54,13 +53,19 @@ private:
     {
         UTF16String str;
 
+        FontSource *fs=CreateFontSource(OS_TEXT("微软雅黑"),12);
+
+        text_render=CreateTextRender(device,fs,device_render_pass,ubo_camera_info);
+        if(!text_render)
+            return(false);
+
         LoadStringFromTextFile(str,OS_TEXT("res/text/DaoDeBible.txt"));
 
-        text_render_obj=text_render->CreateRenderable();
+        text_render_obj=text_render->CreateRenderable(str);
         if(!text_render_obj)
             return(false);
 
-        render_instance=text_render->CreateRenderableInstance(text_render_obj,str);
+        render_instance=text_render->CreateRenderableInstance(text_render_obj);
         if(!render_instance)
             return(false);
 
@@ -77,12 +82,6 @@ public:
         if(!InitUBO())
             return(false);
 
-        FontSource *fs=CreateFontSource(OS_TEXT("微软雅黑"),12);
-
-        text_render=CreateTextRender(device,fs,device_render_pass,ubo_camera_info);
-        if(!text_render)
-            return(false);
-
         if(!InitTextRenderable())
             return(false);
 
diff --git a/inc/hgl/graph/font/TextRender.h b/inc/hgl/graph/font/TextRender.h
index e0830853..9b44ada4 100644
--- a/inc/hgl/graph/font/TextRender.h
+++ b/inc/hgl/graph/font/TextRender.h
@@ -15,23 +15,23 @@ namespace hgl
 
         class TextRender
         {
-            GPUDevice *         device              =nullptr;
-            RenderResource *    db                  =nullptr;
+            GPUDevice *         device;
+            RenderResource *    db;
 
-            Material *          material            =nullptr;
-            MaterialInstance *  material_instance   =nullptr;
+            Material *          material;
+            MaterialInstance *  material_instance;
 
-            Sampler *           sampler             =nullptr;
+            Sampler *           sampler;
 
-            Pipeline *          pipeline            =nullptr;
+            Pipeline *          pipeline;
 
-            FontSource *        font_source         =nullptr;
+            FontSource *        font_source;
 
-            TileFont *          tile_font           =nullptr;
-            TextLayout *        tl_engine           =nullptr;
+            TileFont *          tile_font;
+            TextLayout *        tl_engine;
     
             Color4f             color;
-            GPUBuffer *         ubo_color           =nullptr;
+            GPUBuffer *         ubo_color;
 
         private:
 
@@ -51,8 +51,8 @@ namespace hgl
 
         public:
 
-            TextRenderable *CreateRenderable();
-            RenderableInstance *CreateRenderableInstance(TextRenderable *text_render_obj,const UTF16String &str);
+            TextRenderable *CreateRenderable(const UTF16String &str);
+            RenderableInstance *CreateRenderableInstance(TextRenderable *text_render_obj);
         };//class TextRender
 
         /**
diff --git a/src/SceneGraph/font/TextRender.cpp b/src/SceneGraph/font/TextRender.cpp
index c514dd7c..2c714362 100644
--- a/src/SceneGraph/font/TextRender.cpp
+++ b/src/SceneGraph/font/TextRender.cpp
@@ -17,6 +17,13 @@ namespace hgl
             db=new RenderResource(device);
             tl_engine=new TextLayout();
             font_source=fs;
+            
+            material            =nullptr;
+            material_instance   =nullptr;
+            sampler             =nullptr;
+            pipeline            =nullptr;
+            tile_font           =nullptr;    
+            ubo_color           =nullptr;
         }
 
         TextRender::~TextRender()
@@ -131,16 +138,21 @@ namespace hgl
             return(true);
         }
 
-        TextRenderable *TextRender::CreateRenderable()
+        TextRenderable *TextRender::CreateRenderable(const UTF16String &str)
         {
-            return db->CreateTextRenderable(material);
+            TextRenderable *tr=db->CreateTextRenderable(material);
+
+            if(tl_engine->SimpleLayout(tr,tile_font,str)<=0)
+            {
+                delete tr;
+                return(nullptr);
+            }
+
+            return tr;
         }
 
-        RenderableInstance *TextRender::CreateRenderableInstance(TextRenderable *text_render_obj,const UTF16String &str)
+        RenderableInstance *TextRender::CreateRenderableInstance(TextRenderable *text_render_obj)
         {
-            if(tl_engine->SimpleLayout(text_render_obj,tile_font,str)<=0)
-                return(nullptr);
-
             return db->CreateRenderableInstance(text_render_obj,material_instance,pipeline);
         }