diff --git a/packages/core/src/ref_line.ts b/packages/core/src/ref_line.ts
index fc743053..29dfa5b0 100644
--- a/packages/core/src/ref_line.ts
+++ b/packages/core/src/ref_line.ts
@@ -48,7 +48,10 @@ export class RefLine {
 
   constructor(private editor: SuikaEditor) {}
 
-  cacheXYToBbox() {
+  /**
+   * cache reference line of graphics in viewport
+   */
+  cacheGraphicsRefLines() {
     this.clear();
 
     const vRefLineMap = this.vRefLineMap;
@@ -100,9 +103,9 @@ export class RefLine {
       }
 
       // bbox 中水平线
-      this.addBboxToMap(vRefLineMap, bbox.midX, [bbox.minY, bbox.maxY]);
+      RefLine.addRefLinesToMap(vRefLineMap, bbox.midX, [bbox.minY, bbox.maxY]);
       // bbox 中垂直线
-      this.addBboxToMap(hRefLineMap, bbox.midY, [bbox.minX, bbox.maxX]);
+      RefLine.addRefLinesToMap(hRefLineMap, bbox.midY, [bbox.minX, bbox.maxX]);
 
       /**
        * 获取旋转后4个顶点的坐标
@@ -141,11 +144,11 @@ export class RefLine {
 
       // top 和 bottom 要绘制水平参考线，不要绘制垂直参照线
       for (const p of [...top, ...bottom]) {
-        this.addBboxToMap(vRefLineMap, p.x, [p.y]);
+        RefLine.addRefLinesToMap(vRefLineMap, p.x, [p.y]);
       }
       // left 和 right 要绘制垂直参照线，不要绘制水平参照线
       for (const p of [...left, ...right]) {
-        this.addBboxToMap(hRefLineMap, p.y, [p.x]);
+        RefLine.addRefLinesToMap(hRefLineMap, p.y, [p.x]);
       }
     }
 
@@ -160,7 +163,7 @@ export class RefLine {
     this.toDrawVLines = [];
     this.toDrawHLines = [];
   }
-  private addBboxToMap(
+  static addRefLinesToMap(
     m: Map<number, Set<number>>,
     xOrY: number,
     xsOrYs: number[],
@@ -175,7 +178,7 @@ export class RefLine {
     }
   }
 
-  private getTargetPointFromSelect(record: Map<string, ITransformRect>) {
+  static getGraphicsTargetPoints(record: Map<string, ITransformRect>) {
     let targetPoints: IPoint[] = [];
     // 选中的为单个图形，要以旋转后的 4 个顶点和中心点为目标线
     if (record.size === 1) {
@@ -213,12 +216,7 @@ export class RefLine {
    * update ref line
    * and return offset
    */
-  updateRefLine(record: Map<string, ITransformRect>): {
-    offsetX: number;
-    offsetY: number;
-  } {
-    const targetPoints = this.getTargetPointFromSelect(record);
-
+  getGraphicsSnapOffset(targetPoints: IPoint[]): IPoint | undefined {
     this.toDrawVLines = [];
     this.toDrawHLines = [];
 
@@ -234,7 +232,7 @@ export class RefLine {
 
     // there are no reference graphs
     if (sortedXs.length === 0 && sortedYs.length === 0) {
-      return { offsetX: 0, offsetY: 0 };
+      return undefined;
     }
 
     let offsetX: number | undefined = undefined;
@@ -334,7 +332,7 @@ export class RefLine {
       });
     }
 
-    return { offsetX: offsetX ?? 0, offsetY: offsetY ?? 0 };
+    return { x: offsetX ?? 0, y: offsetY ?? 0 };
   }
 
   drawRefLine(ctx: CanvasRenderingContext2D) {
diff --git a/packages/core/src/tools/tool_draw_graphics.ts b/packages/core/src/tools/tool_draw_graphics.ts
index 2fc39eaf..21253264 100644
--- a/packages/core/src/tools/tool_draw_graphics.ts
+++ b/packages/core/src/tools/tool_draw_graphics.ts
@@ -55,6 +55,14 @@ export abstract class DrawGraphicsTool implements ITool {
     };
     hotkeysManager.on('shiftToggle', updateRect);
 
+    const updateRefLinesWhenViewportTranslate = () => {
+      if (editor.hostEventManager.isDraggingCanvasBySpace) {
+        return;
+      }
+      if (this.isDragging) {
+        this.editor.refLine.cacheGraphicsRefLines();
+      }
+    };
     const updateRectWhenViewportTranslate = () => {
       if (editor.hostEventManager.isDraggingCanvasBySpace) {
         return;
@@ -68,10 +76,18 @@ export abstract class DrawGraphicsTool implements ITool {
         this.updateRect();
       }
     };
+    editor.viewportManager.on(
+      'xOrYChange',
+      updateRefLinesWhenViewportTranslate,
+    );
     editor.viewportManager.on('xOrYChange', updateRectWhenViewportTranslate);
 
     this.unbindEvent = () => {
       hotkeysManager.off('shiftToggle', updateRect);
+      editor.viewportManager.off(
+        'xOrYChange',
+        updateRefLinesWhenViewportTranslate,
+      );
       editor.viewportManager.off('xOrYChange', updateRectWhenViewportTranslate);
     };
   }
@@ -117,13 +133,27 @@ export abstract class DrawGraphicsTool implements ITool {
     if (this.editor.hostEventManager.isDraggingCanvasBySpace) {
       return;
     }
-    this.isDragging = true;
     this.lastDragPointInViewport = this.editor.getCursorXY(e);
 
     this.lastDragPoint = this.lastMousePoint = SnapHelper.getSnapPtBySetting(
       this.editor.getSceneCursorXY(e),
       this.editor.setting,
     );
+
+    if (!this.isDragging) {
+      this.editor.refLine.cacheGraphicsRefLines();
+    }
+    const offset = this.editor.refLine.getGraphicsSnapOffset([
+      this.lastDragPoint,
+    ]);
+    if (offset) {
+      this.lastDragPoint = {
+        x: this.lastDragPoint.x + offset.x,
+        y: this.lastDragPoint.y + offset.y,
+      };
+    }
+    this.isDragging = true;
+
     this.updateRect();
   }
   /**
@@ -346,5 +376,6 @@ export abstract class DrawGraphicsTool implements ITool {
     }
     this.startPointWhenSpaceDown = null;
     this.lastDragPointWhenSpaceDown = null;
+    this.editor.refLine.clear();
   }
 }
diff --git a/packages/core/src/tools/tool_select/tool_select_move.ts b/packages/core/src/tools/tool_select/tool_select_move.ts
index 6f61637a..1b40812b 100644
--- a/packages/core/src/tools/tool_select/tool_select_move.ts
+++ b/packages/core/src/tools/tool_select/tool_select_move.ts
@@ -9,6 +9,7 @@ import {
   type SuikaGraphics,
 } from '../../graphics';
 import { type SuikaCanvas } from '../../graphics/canvas';
+import { RefLine } from '../../ref_line';
 import { Transaction } from '../../transaction';
 import { getDeepFrameAtPoint } from '../../utils';
 import { type IBaseTool } from '../type';
@@ -85,7 +86,7 @@ export class SelectMoveTool implements IBaseTool {
       this.prevBBoxPos = { x: boundingRect.x, y: boundingRect.y };
     }
 
-    this.editor.refLine.cacheXYToBbox();
+    this.editor.refLine.cacheGraphicsRefLines();
   }
   onDrag(e: PointerEvent) {
     this.dragPoint = this.editor.getCursorXY(e);
@@ -141,7 +142,8 @@ export class SelectMoveTool implements IBaseTool {
       });
     }
 
-    const { offsetX, offsetY } = this.editor.refLine.updateRefLine(record);
+    const targetPoints = RefLine.getGraphicsTargetPoints(record);
+    const offset = this.editor.refLine.getGraphicsSnapOffset(targetPoints);
 
     const canvasGraphics = this.editor.doc.getCanvas();
     const newParent =
@@ -155,8 +157,8 @@ export class SelectMoveTool implements IBaseTool {
       const newWorldTf = cloneDeep(
         this.originWorldTfMap.get(graphics.attrs.id)!,
       );
-      newWorldTf[4] += dx + offsetX;
-      newWorldTf[5] += dy + offsetY;
+      newWorldTf[4] += dx + (offset?.x ?? 0);
+      newWorldTf[5] += dy + (offset?.y ?? 0);
 
       // change parent
       if (this.prevParent !== newParent) {