diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2580913ca..7b69a0ada 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,10 +36,9 @@ Please only add new entries below the [Unreleased](#unreleased---releasedate) he
 - **core**: Nodes created by a class implementation may not be disposed of when switching to another class. (#637 @M-Adoo)
 - **core**: When merge multiple `MixBuiltin` widgets, there may be a premature dropping of the outer `MixBuiltin` before it should occur. (#639 @M-Adoo)
 - **core**: `watch!` does not notify the initial value. (#640 @M-Adoo)
-
 - **core**: fix watch multi builtin events not work (#641 @wjian23)
-
 - **core**: fix widget layout when h_algin and v_align are embedded in each other (#641 @wjian23)
+- **painter**: fix elements may not be painted after window resize. (#644 @M-Adoo)
 
 ### Breaking
 
diff --git a/painter/src/painter.rs b/painter/src/painter.rs
index a1054b5d3..c44cc6f63 100644
--- a/painter/src/painter.rs
+++ b/painter/src/painter.rs
@@ -18,7 +18,6 @@ use crate::{
 /// X-axis values progress toward the right edge of the canvas, while Y-axis
 /// values increase towards the bottom edge of the canvas.
 pub struct Painter {
-  viewport: Rect,
   init_state: PainterState,
   state_stack: Vec<PainterState>,
   commands: Vec<PaintCommand>,
@@ -178,7 +177,6 @@ impl Painter {
       init_state,
       commands: vec![],
       path_builder: Path::builder(),
-      viewport,
     }
   }
 
@@ -191,11 +189,11 @@ impl Painter {
     self.reset();
   }
 
-  pub fn viewport(&self) -> &Rect { &self.viewport }
+  pub fn viewport(&self) -> &Rect { &self.init_state.bounds }
 
   /// Change the bounds of the painter can draw.But it won't take effect until
   /// the next time you call [`Painter::reset`]!.
-  pub fn set_viewport(&mut self, bounds: Rect) { self.viewport = bounds; }
+  pub fn set_viewport(&mut self, bounds: Rect) { self.init_state.bounds = bounds; }
 
   pub fn intersection_paint_bounds(&self, rect: &Rect) -> Option<Rect> {
     self.paint_bounds().intersection(rect)