diff --git a/example/CMakeLists.txt b/example/CMakeLists.txt
index 0b60fbf1..7912cc8d 100644
--- a/example/CMakeLists.txt
+++ b/example/CMakeLists.txt
@@ -1 +1,2 @@
-add_subdirectory(NullWindow)
+add_subdirectory(EnumRenderDevice)
+add_subdirectory(NullWindow)
diff --git a/example/EnumRenderDevice/CMakeLists.txt b/example/EnumRenderDevice/CMakeLists.txt
new file mode 100644
index 00000000..14c7de37
--- /dev/null
+++ b/example/EnumRenderDevice/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_executable(EnumRenderDevice main.cpp)
+
+target_link_libraries(EnumRenderDevice PRIVATE MathGeoLib glfw GL ULRE.RenderDevice)
diff --git a/example/EnumRenderDevice/main.cpp b/example/EnumRenderDevice/main.cpp
new file mode 100644
index 00000000..936a68fe
--- /dev/null
+++ b/example/EnumRenderDevice/main.cpp
@@ -0,0 +1,71 @@
+#include<hgl/render/device/RenderDevice.h>
+#include<iostream>
+#include<math.h>
+
+using namespace hgl;
+
+void put(const struct VideoMode *vm)
+{
+    std::cout<<"\t"<<vm->width<<"x"<<vm->height<<","<<vm->bit<<"bits,"<<vm->freq<<"hz";
+}
+
+void put(const struct Display *disp)
+{
+    const int inch=sqrt((disp->width*disp->width)+(disp->height*disp->height))*0.03937008;
+
+    std::cout<<"["<<disp->name.c_str()<<"]["<<disp->width<<"x"<<disp->height<<" mm,"<<inch<<" inch][offset "<<disp->x<<","<<disp->y<<"]"<<std::endl;
+
+    std::cout<<"\tcurrent video mode: ";
+    put(disp->GetCurVideoMode());
+    std::cout<<std::endl;
+
+    const ObjectList<VideoMode> &vml=disp->GetVideoModeList();
+
+    for(int i=0;i<vml.GetCount();i++)
+    {
+        std::cout<<"\t"<<i<<" : ";
+        put(vml[i]);
+        std::cout<<std::endl;
+    }
+}
+
+int main(void)
+{
+    RenderDevice *device=CreateRenderDeviceGLFW();
+
+    if(!device)
+    {
+        std::cerr<<"Create RenderDevice(GLFW) failed."<<std::endl;
+        return -1;
+    }
+
+    if(!device->Init())
+    {
+        std::cerr<<"Init RenderDevice(GLFW) failed."<<std::endl;
+        return -2;
+    }
+
+    {
+        const UTF8String device_name=device->GetName();
+
+        std::cout<<"RenderDevice: "<<device_name.c_str()<<std::endl;
+    }
+
+    List<Display *> disp_list;
+
+    device->GetDisplayList(disp_list);
+
+    const int count=disp_list.GetCount();
+
+    std::cout<<"Device have "<<count<<" display."<<std::endl;
+
+    for(int i=0;i<count;i++)
+    {
+        std::cout<<"Display "<<i<<" ";
+        put(GetObject(disp_list,i));
+
+        std::cout<<std::endl;
+    }
+
+    return 0;
+}