diff --git a/3rdpty/dl_glew.sh b/3rdpty/dl_glew.sh
deleted file mode 100644
index 9325bbd9..00000000
--- a/3rdpty/dl_glew.sh
+++ /dev/null
@@ -1 +0,0 @@
-git clone https://github.com/nigels-com/glew.git glew
diff --git a/3rdpty/dl_glewcore.sh b/3rdpty/dl_glewcore.sh
new file mode 100755
index 00000000..469919cb
--- /dev/null
+++ b/3rdpty/dl_glewcore.sh
@@ -0,0 +1 @@
+git clone https://github.com/hyzboy/GLEWCore.git GLEWCore
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 248dfee0..69a5295f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,14 +15,17 @@ set_compiler_param()
 set_output_directory()
 
 include_directories(3rdpty/MathGeoLib/src)
+include_directories(3rdpty/GLEWCore/inc)
 include_directories(inc)
 
 add_subdirectory(3rdpty/MathGeoLib)
+add_subdirectory(3rdpty/GLEWCore)
 add_subdirectory(src)
 
 SET(ULRE    ULRE.RenderDevice
             ULRE.RenderDriver
             MathGeoLib
+            GLEWCore
             glfw
             GL)
 
diff --git a/example/DirectGLRender/main.cpp b/example/DirectGLRender/main.cpp
index 3f06c69a..cca14813 100644
--- a/example/DirectGLRender/main.cpp
+++ b/example/DirectGLRender/main.cpp
@@ -1,17 +1,24 @@
 #include<hgl/render/RenderDevice.h>
 #include<hgl/render/RenderWindow.h>
 #include<iostream>
-#include<GLFW/glfw3.h>
-#include<GL/glext.h>
+#include<GLEWCore/glew.h>
 
 using namespace hgl;
 
+constexpr GLfloat clear_color[4]=
+{
+    77.f/255.f,
+    78.f/255.f,
+    83.f/255.f,
+    1.f
+};
 
+constexpr GLfloat clear_depth=1.0f;
 
 void draw()
 {
-    glClearColor(0,0,0,1);          //设置清屏颜色
-    glClear(GL_COLOR_BUFFER_BIT);   //清屏
+    glClearBufferfv(GL_COLOR,0,clear_color);
+    glClearBufferfv(GL_DEPTH,0,&clear_depth);
 }
 
 int main(void)
@@ -32,7 +39,7 @@ int main(void)
 
     WindowSetup ws;
 
-    ws.Name=U8_TEXT("Direct OpenGL Render");
+    ws.Name=U8_TEXT("Direct use \"OpenGL Core API\" Render");
 
     RenderSetup rs;
 
diff --git a/example/OutputGLInfo/main.cpp b/example/OutputGLInfo/main.cpp
index a0e96155..e5c3128d 100644
--- a/example/OutputGLInfo/main.cpp
+++ b/example/OutputGLInfo/main.cpp
@@ -2,8 +2,7 @@
 #include<hgl/render/RenderWindow.h>
 #include<iostream>
 #include<string.h>
-#include<GLFW/glfw3.h>
-#include<GL/glcorearb.h>
+#include<GLEWCore/glew.h>
 
 using namespace hgl;
 
@@ -19,8 +18,6 @@ void output_ogl_info()
     std::cout<<"Renderer:   "<<glGetString(GL_RENDERER)<<std::endl;
     std::cout<<"Version:    "<<glGetString(GL_VERSION)<<std::endl;
 
-    PFNGLGETSTRINGIPROC glGetStringi = (PFNGLGETSTRINGIPROC)glfwGetProcAddress("glGetStringi");
-
     if(!glGetStringi)
         return;
 
@@ -77,5 +74,3 @@ int main(int argc,char **argv)
 
     return 0;
 }
-
-
diff --git a/src/RenderDevice/GLFW/RenderDeviceGLFW.cpp b/src/RenderDevice/GLFW/RenderDeviceGLFW.cpp
index 43945da1..2f10ce17 100644
--- a/src/RenderDevice/GLFW/RenderDeviceGLFW.cpp
+++ b/src/RenderDevice/GLFW/RenderDeviceGLFW.cpp
@@ -1,4 +1,5 @@
 #include<hgl/render/RenderDevice.h>
+#include<GLEWCore/glew.h>
 #include<GLFW/glfw3.h>
 #include<iostream>
 
@@ -8,8 +9,21 @@ namespace hgl
 
     namespace
     {
+        static bool init_glew=false;
         static RenderDevice *render_device_glfw=nullptr;
 
+        void InitGLEWCore()
+        {
+            if(!init_glew)
+                init_glew=glewInit();
+        }
+
+        void CloseGLEWCore()
+        {
+            glewTerminate();
+            init_glew=false;
+        }
+
         void glfw_error_callback(int err,const char *desc)
         {
             std::cerr<<"glfw return error["<<err<<"] <<"<<desc<<std::endl;
@@ -131,6 +145,7 @@ namespace hgl
 
         ~RenderDeviceGLFW()
         {
+            CloseGLEWCore();
             glfwTerminate();
             render_device_glfw=nullptr;
         }
@@ -178,6 +193,9 @@ namespace hgl
 
             if(!win)return(nullptr);
 
+            glfwMakeContextCurrent(win);
+            InitGLEWCore();
+
             return(CreateRenderWindowGLFW(win,false));
         }
 
@@ -198,6 +216,9 @@ namespace hgl
 
             if(!win)return(nullptr);
 
+            glfwMakeContextCurrent(win);
+            InitGLEWCore();
+
             return(CreateRenderWindowGLFW(win,true));
         }
     };//class RenderDevice
diff --git a/src/RenderDriver/CMakeLists.txt b/src/RenderDriver/CMakeLists.txt
index dcd21d2a..9ae3c2d7 100644
--- a/src/RenderDriver/CMakeLists.txt
+++ b/src/RenderDriver/CMakeLists.txt
@@ -1,4 +1,2 @@
-add_library(ULRE.RenderDriver STATIC    GLCore/glew.c
-                                        GLCore/OpenGLCoreExtensions.c
-                                        GLCore/RenderDriverGLCore.cpp)
+add_library(ULRE.RenderDriver STATIC    GLCore/RenderDriverGLCore.cpp)