diff --git a/docs/guide/shortcut-internal.md b/docs/guide/shortcut-internal.md
index 4f13eab..7877567 100644
--- a/docs/guide/shortcut-internal.md
+++ b/docs/guide/shortcut-internal.md
@@ -12,9 +12,15 @@
 ## ←
 功能：向左移动
 
+## Shift + ←
+功能：向左扩大选区
+
 ## →
 功能：向右移动
 
+## Shift + →
+功能：向右扩大选区
+
 ## ↑
 功能：向上移动
 
diff --git a/src/editor/core/event/handlers/keydown.ts b/src/editor/core/event/handlers/keydown.ts
index 82d4718..cdf3a70 100644
--- a/src/editor/core/event/handlers/keydown.ts
+++ b/src/editor/core/event/handlers/keydown.ts
@@ -88,24 +88,30 @@ export function keydown(evt: KeyboardEvent, host: CanvasEvent) {
   } else if (evt.key === KeyMap.Left) {
     if (isReadonly) return
     if (index > 0) {
-      const curIndex = index - 1
-      rangeManager.setRange(curIndex, curIndex)
+      const curIndex = startIndex - 1
+      // shift则向左扩大选区
+      const anchorIndex = evt.shiftKey ? endIndex : curIndex
+      rangeManager.setRange(curIndex, anchorIndex)
       draw.render({
         curIndex,
         isSubmitHistory: false,
         isComputeRowList: false
       })
+      evt.preventDefault()
     }
   } else if (evt.key === KeyMap.Right) {
     if (isReadonly) return
     if (index < positionList.length - 1) {
-      const curIndex = index + 1
-      rangeManager.setRange(curIndex, curIndex)
+      const curIndex = endIndex + 1
+      // shift则向右扩大选区
+      const anchorIndex = evt.shiftKey ? startIndex : curIndex
+      rangeManager.setRange(anchorIndex, curIndex)
       draw.render({
         curIndex,
         isSubmitHistory: false,
         isComputeRowList: false
       })
+      evt.preventDefault()
     }
   } else if (evt.key === KeyMap.Up || evt.key === KeyMap.Down) {
     if (isReadonly) return