diff --git a/src/modules/lesson-preparation/hooks/selection-slice.ts b/src/modules/lesson-preparation/hooks/selection-slice.ts
index 8ac0e41..9f508b0 100644
--- a/src/modules/lesson-preparation/hooks/selection-slice.ts
+++ b/src/modules/lesson-preparation/hooks/selection-slice.ts
@@ -2,8 +2,12 @@ import type { StateCreator } from "zustand";
 import type { EditorState } from "./use-lesson-plan-editor";
 
 export interface SelectionSlice {
+  /** 当前在右栏详情面板显示的节点 ID */
   selectedNodeId: string | null;
+  /** 纸上选中文本时，待锚定的目标节点 ID（用户从右键菜单选择节点后设置） */
+  anchorNodeForSelection: string | null;
   selectNode: (id: string | null) => void;
+  setAnchorNodeForSelection: (id: string | null) => void;
 }
 
 export const createSelectionSlice: StateCreator<
@@ -13,5 +17,7 @@ export const createSelectionSlice: StateCreator<
   SelectionSlice
 > = (set) => ({
   selectedNodeId: null,
+  anchorNodeForSelection: null,
   selectNode: (id) => set({ selectedNodeId: id }),
+  setAnchorNodeForSelection: (id) => set({ anchorNodeForSelection: id }),
 });