diff --git a/.vscode/settings.json b/.vscode/settings.json
index 02034a7..213b9d5 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -24,6 +24,7 @@
     "rowspan",
     "TEXTLIKE",
     "trlist",
+    "updown",
     "vite",
     "vitepress",
     "Yahei"
diff --git a/src/editor/core/event/handlers/keydown/backspace.ts b/src/editor/core/event/handlers/keydown/backspace.ts
new file mode 100644
index 0000000..044ac15
--- /dev/null
+++ b/src/editor/core/event/handlers/keydown/backspace.ts
@@ -0,0 +1,60 @@
+import { ZERO } from '../../../../dataset/constant/Common'
+import { CanvasEvent } from '../../CanvasEvent'
+
+export function backspace(evt: KeyboardEvent, host: CanvasEvent) {
+  const draw = host.getDraw()
+  const isReadonly = draw.isReadonly()
+  if (isReadonly) return
+  // 控件整体性验证
+  const control = draw.getControl()
+  const activeControl = control.getActiveControl()
+  if (control.isPartRangeInControlOutside()) return
+  const rangeManager = draw.getRange()
+  let curIndex: number | null
+  if (activeControl) {
+    // 光标在控件内
+    curIndex = control.keydown(evt)
+  } else {
+    // 普通元素删除
+    const position = draw.getPosition()
+    const cursorPosition = position.getCursorPosition()
+    if (!cursorPosition) return
+    const { index } = cursorPosition
+    const { startIndex, endIndex } = rangeManager.getRange()
+    const isCollapsed = rangeManager.getIsCollapsed()
+    const elementList = draw.getElementList()
+    // 判断是否允许删除
+    if (isCollapsed && index === 0) {
+      const firstElement = elementList[index]
+      if (firstElement.value === ZERO) {
+        // 取消首字符列表设置
+        if (firstElement.listId) {
+          draw.getListParticle().unsetList()
+        }
+        evt.preventDefault()
+        return
+      }
+    }
+    //  清空当前行对齐方式
+    const startElement = elementList[startIndex]
+    if (isCollapsed && startElement.rowFlex && startElement.value === ZERO) {
+      const rowList = draw.getRowList()
+      const positionList = position.getPositionList()
+      const rowNo = positionList[startIndex].rowNo
+      const rowFlexElementList = rowList[rowNo].elementList
+      rowFlexElementList.forEach(element => {
+        delete element.rowFlex
+      })
+    }
+    if (!isCollapsed) {
+      draw.spliceElementList(elementList, startIndex + 1, endIndex - startIndex)
+    } else {
+      draw.spliceElementList(elementList, index, 1)
+    }
+    curIndex = isCollapsed ? index - 1 : startIndex
+  }
+  if (curIndex === null) return
+  draw.getGlobalEvent().setCanvasEventAbility()
+  rangeManager.setRange(curIndex, curIndex)
+  draw.render({ curIndex })
+}
diff --git a/src/editor/core/event/handlers/keydown/delete.ts b/src/editor/core/event/handlers/keydown/delete.ts
new file mode 100644
index 0000000..b831b51
--- /dev/null
+++ b/src/editor/core/event/handlers/keydown/delete.ts
@@ -0,0 +1,39 @@
+import { CanvasEvent } from '../../CanvasEvent'
+
+export function del(evt: KeyboardEvent, host: CanvasEvent) {
+  const draw = host.getDraw()
+  const isReadonly = draw.isReadonly()
+  if (isReadonly) return
+  // 控件整体性验证
+  const control = draw.getControl()
+  const activeControl = control.getActiveControl()
+  if (control.isPartRangeInControlOutside()) return
+  const rangeManager = draw.getRange()
+  const { startIndex, endIndex } = rangeManager.getRange()
+  const elementList = draw.getElementList()
+  let curIndex: number | null
+  if (activeControl) {
+    // 光标在控件内
+    curIndex = control.keydown(evt)
+  } else if (elementList[endIndex + 1]?.controlId) {
+    // 光标在控件前
+    curIndex = control.removeControl(endIndex + 1)
+  } else {
+    // 普通元素
+    const position = draw.getPosition()
+    const cursorPosition = position.getCursorPosition()
+    if (!cursorPosition) return
+    const { index } = cursorPosition
+    const isCollapsed = rangeManager.getIsCollapsed()
+    if (!isCollapsed) {
+      draw.spliceElementList(elementList, startIndex + 1, endIndex - startIndex)
+    } else {
+      draw.spliceElementList(elementList, index + 1, 1)
+    }
+    curIndex = isCollapsed ? index : startIndex
+  }
+  if (curIndex === null) return
+  draw.getGlobalEvent().setCanvasEventAbility()
+  rangeManager.setRange(curIndex, curIndex)
+  draw.render({ curIndex })
+}
diff --git a/src/editor/core/event/handlers/keydown/index.ts b/src/editor/core/event/handlers/keydown/index.ts
index 2cf031e..f5e1d45 100644
--- a/src/editor/core/event/handlers/keydown/index.ts
+++ b/src/editor/core/event/handlers/keydown/index.ts
@@ -1,99 +1,23 @@
-import { ZERO } from '../../../../dataset/constant/Common'
 import { EditorMode, EditorZone } from '../../../../dataset/enum/Editor'
-import { ElementType } from '../../../../dataset/enum/Element'
 import { KeyMap } from '../../../../dataset/enum/KeyMap'
-import { MoveDirection } from '../../../../dataset/enum/Observer'
-import { IElement, IElementPosition } from '../../../../interface/Element'
-import { formatElementContext } from '../../../../utils/element'
 import { isMod } from '../../../../utils/hotkey'
 import { CanvasEvent } from '../../CanvasEvent'
+import { backspace } from './backspace'
+import { del } from './delete'
 import { enter } from './enter'
 import { left } from './left'
 import { right } from './right'
+import { tab } from './tab'
+import { updown } from './updown'
 
 export function keydown(evt: KeyboardEvent, host: CanvasEvent) {
   if (host.isComposing) return
   const draw = host.getDraw()
-  const position = draw.getPosition()
-  const cursorPosition = position.getCursorPosition()
-  if (!cursorPosition) return
-  const isReadonly = draw.isReadonly()
-  const historyManager = draw.getHistoryManager()
-  const elementList = draw.getElementList()
-  const positionList = position.getPositionList()
-  const { index } = cursorPosition
-  const rangeManager = draw.getRange()
-  const { startIndex, endIndex } = rangeManager.getRange()
-  const isCollapsed = startIndex === endIndex
-  // 当前激活控件
-  const control = draw.getControl()
-  const activeControl = control.getActiveControl()
+  // 键盘事件逻辑分发
   if (evt.key === KeyMap.Backspace) {
-    if (isReadonly || control.isPartRangeInControlOutside()) return
-    let curIndex: number | null
-    if (activeControl) {
-      curIndex = control.keydown(evt)
-    } else {
-      // 判断是否允许删除
-      if (isCollapsed && index === 0) {
-        const firstElement = elementList[index]
-        if (firstElement.value === ZERO) {
-          // 取消首字符列表设置
-          if (firstElement.listId) {
-            draw.getListParticle().unsetList()
-          }
-          evt.preventDefault()
-          return
-        }
-      }
-      //  清空当前行对齐方式
-      const startElement = elementList[startIndex]
-      if (isCollapsed && startElement.rowFlex && startElement.value === ZERO) {
-        const rowList = draw.getRowList()
-        const rowNo = positionList[startIndex].rowNo
-        const rowFlexElementList = rowList[rowNo].elementList
-        rowFlexElementList.forEach(element => {
-          delete element.rowFlex
-        })
-      }
-      if (!isCollapsed) {
-        draw.spliceElementList(
-          elementList,
-          startIndex + 1,
-          endIndex - startIndex
-        )
-      } else {
-        draw.spliceElementList(elementList, index, 1)
-      }
-      curIndex = isCollapsed ? index - 1 : startIndex
-    }
-    if (curIndex === null) return
-    draw.getGlobalEvent().setCanvasEventAbility()
-    rangeManager.setRange(curIndex, curIndex)
-    draw.render({ curIndex })
+    backspace(evt, host)
   } else if (evt.key === KeyMap.Delete) {
-    if (isReadonly || control.isPartRangeInControlOutside()) return
-    let curIndex: number | null
-    if (activeControl) {
-      curIndex = control.keydown(evt)
-    } else if (elementList[endIndex + 1]?.controlId) {
-      curIndex = control.removeControl(endIndex + 1)
-    } else {
-      if (!isCollapsed) {
-        draw.spliceElementList(
-          elementList,
-          startIndex + 1,
-          endIndex - startIndex
-        )
-      } else {
-        draw.spliceElementList(elementList, index + 1, 1)
-      }
-      curIndex = isCollapsed ? index : startIndex
-    }
-    if (curIndex === null) return
-    draw.getGlobalEvent().setCanvasEventAbility()
-    rangeManager.setRange(curIndex, curIndex)
-    draw.render({ curIndex })
+    del(evt, host)
   } else if (evt.key === KeyMap.Enter) {
     enter(evt, host)
   } else if (evt.key === KeyMap.Left) {
@@ -101,124 +25,14 @@ export function keydown(evt: KeyboardEvent, host: CanvasEvent) {
   } else if (evt.key === KeyMap.Right) {
     right(evt, host)
   } else if (evt.key === KeyMap.Up || evt.key === KeyMap.Down) {
-    if (isReadonly) return
-    let anchorPosition: IElementPosition = cursorPosition
-    // 扩大选区时，判断移动光标点
-    if (evt.shiftKey) {
-      if (startIndex === cursorPosition.index) {
-        anchorPosition = positionList[endIndex]
-      } else {
-        anchorPosition = positionList[startIndex]
-      }
-    }
-    const {
-      index,
-      rowNo,
-      rowIndex,
-      coordinate: {
-        leftTop: [curLeftX],
-        rightTop: [curRightX]
-      }
-    } = anchorPosition
-    // 向上时在首行、向下时在尾行则忽略
-    const isUp = evt.key === KeyMap.Up
-    if (
-      (isUp && rowIndex === 0) ||
-      (!isUp && rowIndex === draw.getRowCount() - 1)
-    ) {
-      return
-    }
-    // 查找下一行位置列表
-    const probablePosition: IElementPosition[] = []
-    if (isUp) {
-      let p = index - 1
-      while (p > 0) {
-        const position = positionList[p]
-        p--
-        if (position.rowNo === rowNo) continue
-        if (
-          probablePosition[0] &&
-          probablePosition[0].rowNo !== position.rowNo
-        ) {
-          break
-        }
-        probablePosition.unshift(position)
-      }
-    } else {
-      let p = index + 1
-      while (p < positionList.length) {
-        const position = positionList[p]
-        p++
-        if (position.rowNo === rowNo) continue
-        if (
-          probablePosition[0] &&
-          probablePosition[0].rowNo !== position.rowNo
-        ) {
-          break
-        }
-        probablePosition.push(position)
-      }
-    }
-    // 查找下一行位置：第一个存在交叉宽度的元素位置
-    let nextIndex = 0
-    for (let p = 0; p < probablePosition.length; p++) {
-      const nextPosition = probablePosition[p]
-      const {
-        coordinate: {
-          leftTop: [nextLeftX],
-          rightTop: [nextRightX]
-        }
-      } = nextPosition
-      if (p === probablePosition.length - 1) {
-        nextIndex = nextPosition.index
-      }
-      if (curRightX <= nextLeftX || curLeftX >= nextRightX) continue
-      nextIndex = nextPosition.index
-      break
-    }
-    if (!nextIndex) return
-    // shift则缩放选区
-    let anchorStartIndex = nextIndex
-    let anchorEndIndex = nextIndex
-    if (evt.shiftKey) {
-      if (startIndex !== endIndex) {
-        if (startIndex === cursorPosition.index) {
-          anchorStartIndex = startIndex
-        } else {
-          anchorEndIndex = endIndex
-        }
-      } else {
-        if (isUp) {
-          anchorEndIndex = endIndex
-        } else {
-          anchorStartIndex = startIndex
-        }
-      }
-    }
-    if (anchorStartIndex > anchorEndIndex) {
-      // prettier-ignore
-      [anchorStartIndex, anchorEndIndex] = [anchorEndIndex, anchorStartIndex]
-    }
-    rangeManager.setRange(anchorStartIndex, anchorEndIndex)
-    const isCollapsed = anchorStartIndex === anchorEndIndex
-    draw.render({
-      curIndex: isCollapsed ? anchorStartIndex : undefined,
-      isSetCursor: isCollapsed,
-      isSubmitHistory: false,
-      isCompute: false
-    })
-    // 将光标移动到可视范围内
-    draw.getCursor().moveCursorToVisible({
-      cursorPosition: positionList[isUp ? anchorStartIndex : anchorEndIndex],
-      direction: isUp ? MoveDirection.UP : MoveDirection.DOWN
-    })
+    updown(evt, host)
   } else if (isMod(evt) && evt.key === KeyMap.Z) {
-    if (isReadonly && draw.getMode() !== EditorMode.FORM) return
-    historyManager.undo()
+    if (draw.isReadonly() && draw.getMode() !== EditorMode.FORM) return
+    draw.getHistoryManager().undo()
     evt.preventDefault()
   } else if (isMod(evt) && evt.key === KeyMap.Y) {
-    if (isReadonly && draw.getMode() !== EditorMode.FORM) return
-    historyManager.redo()
+    if (draw.isReadonly() && draw.getMode() !== EditorMode.FORM) return
+    draw.getHistoryManager().redo()
     evt.preventDefault()
   } else if (isMod(evt) && evt.key === KeyMap.C) {
     host.copy()
@@ -230,7 +44,7 @@ export function keydown(evt: KeyboardEvent, host: CanvasEvent) {
     host.selectAll()
     evt.preventDefault()
   } else if (isMod(evt) && evt.key === KeyMap.S) {
-    if (isReadonly) return
+    if (draw.isReadonly()) return
     const listener = draw.getListener()
     if (listener.saved) {
       listener.saved(draw.getValue())
@@ -250,12 +64,6 @@ export function keydown(evt: KeyboardEvent, host: CanvasEvent) {
     }
     evt.preventDefault()
   } else if (evt.key === KeyMap.TAB) {
-    const tabElement: IElement = {
-      type: ElementType.TAB,
-      value: ''
-    }
-    formatElementContext(elementList, [tabElement], startIndex)
-    draw.insertElementList([tabElement])
-    evt.preventDefault()
+    tab(evt, host)
   }
 }
diff --git a/src/editor/core/event/handlers/keydown/tab.ts b/src/editor/core/event/handlers/keydown/tab.ts
new file mode 100644
index 0000000..b1f75c6
--- /dev/null
+++ b/src/editor/core/event/handlers/keydown/tab.ts
@@ -0,0 +1,20 @@
+import { ElementType } from '../../../../dataset/enum/Element'
+import { IElement } from '../../../../interface/Element'
+import { formatElementContext } from '../../../../utils/element'
+import { CanvasEvent } from '../../CanvasEvent'
+
+export function tab(evt: KeyboardEvent, host: CanvasEvent) {
+  const draw = host.getDraw()
+  const isReadonly = draw.isReadonly()
+  if (isReadonly) return
+  const tabElement: IElement = {
+    type: ElementType.TAB,
+    value: ''
+  }
+  const rangeManager = draw.getRange()
+  const { startIndex } = rangeManager.getRange()
+  const elementList = draw.getElementList()
+  formatElementContext(elementList, [tabElement], startIndex)
+  draw.insertElementList([tabElement])
+  evt.preventDefault()
+}
diff --git a/src/editor/core/event/handlers/keydown/updown.ts b/src/editor/core/event/handlers/keydown/updown.ts
new file mode 100644
index 0000000..222bd36
--- /dev/null
+++ b/src/editor/core/event/handlers/keydown/updown.ts
@@ -0,0 +1,120 @@
+import { KeyMap } from '../../../../dataset/enum/KeyMap'
+import { MoveDirection } from '../../../../dataset/enum/Observer'
+import { IElementPosition } from '../../../../interface/Element'
+import { CanvasEvent } from '../../CanvasEvent'
+
+export function updown(evt: KeyboardEvent, host: CanvasEvent) {
+  const draw = host.getDraw()
+  const isReadonly = draw.isReadonly()
+  if (isReadonly) return
+  const position = draw.getPosition()
+  const cursorPosition = position.getCursorPosition()
+  if (!cursorPosition) return
+  const rangeManager = draw.getRange()
+  const { startIndex, endIndex } = rangeManager.getRange()
+  const positionList = position.getPositionList()
+  let anchorPosition: IElementPosition = cursorPosition
+  // 扩大选区时，判断移动光标点
+  if (evt.shiftKey) {
+    if (startIndex === cursorPosition.index) {
+      anchorPosition = positionList[endIndex]
+    } else {
+      anchorPosition = positionList[startIndex]
+    }
+  }
+  const {
+    index,
+    rowNo,
+    rowIndex,
+    coordinate: {
+      leftTop: [curLeftX],
+      rightTop: [curRightX]
+    }
+  } = anchorPosition
+  // 向上时在首行、向下时在尾行则忽略
+  const isUp = evt.key === KeyMap.Up
+  if (
+    (isUp && rowIndex === 0) ||
+    (!isUp && rowIndex === draw.getRowCount() - 1)
+  ) {
+    return
+  }
+  // 查找下一行位置列表
+  const probablePosition: IElementPosition[] = []
+  if (isUp) {
+    let p = index - 1
+    while (p > 0) {
+      const position = positionList[p]
+      p--
+      if (position.rowNo === rowNo) continue
+      if (probablePosition[0] && probablePosition[0].rowNo !== position.rowNo) {
+        break
+      }
+      probablePosition.unshift(position)
+    }
+  } else {
+    let p = index + 1
+    while (p < positionList.length) {
+      const position = positionList[p]
+      p++
+      if (position.rowNo === rowNo) continue
+      if (probablePosition[0] && probablePosition[0].rowNo !== position.rowNo) {
+        break
+      }
+      probablePosition.push(position)
+    }
+  }
+  // 查找下一行位置：第一个存在交叉宽度的元素位置
+  let nextIndex = 0
+  for (let p = 0; p < probablePosition.length; p++) {
+    const nextPosition = probablePosition[p]
+    const {
+      coordinate: {
+        leftTop: [nextLeftX],
+        rightTop: [nextRightX]
+      }
+    } = nextPosition
+    if (p === probablePosition.length - 1) {
+      nextIndex = nextPosition.index
+    }
+    if (curRightX <= nextLeftX || curLeftX >= nextRightX) continue
+    nextIndex = nextPosition.index
+    break
+  }
+  if (!nextIndex) return
+  // shift则缩放选区
+  let anchorStartIndex = nextIndex
+  let anchorEndIndex = nextIndex
+  if (evt.shiftKey) {
+    if (startIndex !== endIndex) {
+      if (startIndex === cursorPosition.index) {
+        anchorStartIndex = startIndex
+      } else {
+        anchorEndIndex = endIndex
+      }
+    } else {
+      if (isUp) {
+        anchorEndIndex = endIndex
+      } else {
+        anchorStartIndex = startIndex
+      }
+    }
+  }
+  if (anchorStartIndex > anchorEndIndex) {
+    // prettier-ignore
+    [anchorStartIndex, anchorEndIndex] = [anchorEndIndex, anchorStartIndex]
+  }
+  rangeManager.setRange(anchorStartIndex, anchorEndIndex)
+  const isCollapsed = anchorStartIndex === anchorEndIndex
+  draw.render({
+    curIndex: isCollapsed ? anchorStartIndex : undefined,
+    isSetCursor: isCollapsed,
+    isSubmitHistory: false,
+    isCompute: false
+  })
+  // 将光标移动到可视范围内
+  draw.getCursor().moveCursorToVisible({
+    cursorPosition: positionList[isUp ? anchorStartIndex : anchorEndIndex],
+    direction: isUp ? MoveDirection.UP : MoveDirection.DOWN
+  })
+}