diff --git a/src/kunpocc.ts b/src/kunpocc.ts
index 1f53b0f..db79336 100644
--- a/src/kunpocc.ts
+++ b/src/kunpocc.ts
@@ -31,9 +31,9 @@ export { ReadNetFile } from "./net/nettools/ReadNetFile";
 /** 四叉树 */
 export { Box } from "./quadtree/Box";
 export { Circle } from "./quadtree/Circle";
+export { IShape } from "./quadtree/IShape";
 export { Polygon } from "./quadtree/Polygon";
 export { QTConfig, QuadTree } from "./quadtree/QuadTree";
-export { Shape } from "./quadtree/Shape";
 
 /** 行为树 */
 export { Agent as BTAgent } from "./behaviortree/Agent";
diff --git a/src/quadtree/Circle.ts b/src/quadtree/Circle.ts
index 76d1d6a..9a65e1d 100644
--- a/src/quadtree/Circle.ts
+++ b/src/quadtree/Circle.ts
@@ -9,7 +9,7 @@ import { ShapeType } from "./IShape";
 import { Shape } from "./Shape";
 
 export class Circle extends Shape {
-    public radius: number; // 半径
+    private _radius: number; // 半径
 
     public get shapeType(): ShapeType {
         return ShapeType.CIRCLE;
@@ -17,14 +17,26 @@ export class Circle extends Shape {
 
     constructor(radius: number, tag: number = -1) {
         super(tag);
-        this.radius = radius;
-        this._boundingBox.x = -this.radius;
-        this._boundingBox.y = -this.radius;
-        this._boundingBox.width = this.radius * 2;
-        this._boundingBox.height = this.radius * 2;
+        this._radius = radius;
+        this._boundingBox.x = -this._radius;
+        this._boundingBox.y = -this._radius;
+        this._boundingBox.width = this._radius * 2;
+        this._boundingBox.height = this._radius * 2;
     }
 
     public getBoundingBox(): Rect {
         return this._boundingBox;
     }
+
+    public get radius(): number {
+        return this._radius;
+    }
+
+    public set radius(value: number) {
+        this._radius = value;
+        this._boundingBox.x = -this._radius;
+        this._boundingBox.y = -this._radius;
+        this._boundingBox.width = this._radius * 2;
+        this._boundingBox.height = this._radius * 2;
+    }
 }
\ No newline at end of file
diff --git a/src/quadtree/Polygon.ts b/src/quadtree/Polygon.ts
index 7066dea..d3266d4 100644
--- a/src/quadtree/Polygon.ts
+++ b/src/quadtree/Polygon.ts
@@ -87,5 +87,6 @@ export class Polygon extends Shape {
         for (let i = 0, len = pts.length; i < len; i++) {
             this._realPoints[i] = v2(pts[i].x, pts[i].y);
         }
+        this._isDirty = true;
     }
 }
\ No newline at end of file