diff --git a/os/src/assert/desktop.bmp b/os/src/assert/desktop.bmp
index d8545df..a754f7a 100644
Binary files a/os/src/assert/desktop.bmp and b/os/src/assert/desktop.bmp differ
diff --git a/os/src/gui/graphic.rs b/os/src/gui/graphic.rs
index 0fdfce9..2092d71 100644
--- a/os/src/gui/graphic.rs
+++ b/os/src/gui/graphic.rs
@@ -42,7 +42,7 @@ impl DrawTarget for Graphics {
         let fb = self.drv.getfreambuffer();
 
         pixels.into_iter().for_each(|px| {
-            let idx = ((self.point.y + px.0.y) * 1024 + self.point.x + px.0.x) as usize * 4;
+            let idx = ((self.point.y + px.0.y) * 1280 + self.point.x + px.0.x) as usize * 4;
             if idx + 2 >= fb.len() {
                 return;
             }
diff --git a/os/src/gui/icon.rs b/os/src/gui/icon.rs
index d70462a..645d9e7 100644
--- a/os/src/gui/icon.rs
+++ b/os/src/gui/icon.rs
@@ -32,7 +32,7 @@ impl IconController {
                 UPIntrFreeCell::new(IconControllerInner {
                     files,
                     graphic: Graphics {
-                        size: Size::new(1024, 768),
+                        size: Size::new(1280, 800),
                         point: Point::new(0, 0),
                         drv: GPU_DEVICE.clone(),
                     },
diff --git a/os/src/syscall/gui.rs b/os/src/syscall/gui.rs
index 9ca7f45..5340d11 100644
--- a/os/src/syscall/gui.rs
+++ b/os/src/syscall/gui.rs
@@ -14,7 +14,7 @@ static DT: &[u8] = include_bytes!("../assert/desktop.bmp");
 
 lazy_static::lazy_static!(
     pub static ref DESKTOP:UPIntrFreeCell<Arc<dyn Component>> = unsafe {
-        UPIntrFreeCell::new(Arc::new(Panel::new(Size::new(1024, 768), Point::new(0, 0))))
+        UPIntrFreeCell::new(Arc::new(Panel::new(Size::new(1280, 800), Point::new(0, 0))))
     };
     pub static ref PAD:UPIntrFreeCell<Option<Arc<Terminal>>> = unsafe {
         UPIntrFreeCell::new(None)
@@ -23,8 +23,8 @@ lazy_static::lazy_static!(
 
 pub fn create_desktop() -> isize {
     let mut p: Arc<dyn Component + 'static> =
-        Arc::new(Panel::new(Size::new(1024, 768), Point::new(0, 0)));
-    let image = ImageComp::new(Size::new(1024, 768), Point::new(0, 0), DT, Some(p.clone()));
+        Arc::new(Panel::new(Size::new(1280, 800), Point::new(0, 0)));
+    let image = ImageComp::new(Size::new(1280, 800), Point::new(0, 0), DT, Some(p.clone()));
     let icon = IconController::new(ROOT_INODE.ls(), Some(p.clone()));
     p.add(Arc::new(image));
     p.add(Arc::new(icon));