diff --git a/src/editor/core/command/Command.ts b/src/editor/core/command/Command.ts
index d619539..a98b5cb 100644
--- a/src/editor/core/command/Command.ts
+++ b/src/editor/core/command/Command.ts
@@ -12,6 +12,8 @@ export class Command {
   private static copy: Function
   private static paste: Function
   private static selectAll: Function
+  private static backspace: Function
+  private static setRange: Function
   private static undo: Function
   private static redo: Function
   private static painter: Function
@@ -60,6 +62,8 @@ export class Command {
     Command.copy = adapt.copy.bind(adapt)
     Command.paste = adapt.paste.bind(adapt)
     Command.selectAll = adapt.selectAll.bind(adapt)
+    Command.backspace = adapt.backspace.bind(adapt)
+    Command.setRange = adapt.setRange.bind(adapt)
     Command.undo = adapt.undo.bind(adapt)
     Command.redo = adapt.redo.bind(adapt)
     Command.painter = adapt.painter.bind(adapt)
@@ -124,6 +128,14 @@ export class Command {
     return Command.selectAll()
   }
 
+  public executeBackspace() {
+    return Command.backspace()
+  }
+
+  public executeSetRange(startIndex: number, endIndex: number) {
+    return Command.setRange(startIndex, endIndex)
+  }
+
   // 撤销、重做、格式刷、清除格式
   public executeUndo() {
     return Command.undo()
diff --git a/src/editor/core/command/CommandAdapt.ts b/src/editor/core/command/CommandAdapt.ts
index 45d0f4c..f56bf24 100644
--- a/src/editor/core/command/CommandAdapt.ts
+++ b/src/editor/core/command/CommandAdapt.ts
@@ -78,6 +78,38 @@ export class CommandAdapt {
     this.canvasEvent.selectAll()
   }
 
+  public backspace() {
+    const isReadonly = this.draw.isReadonly()
+    if (isReadonly) return
+    const elementList = this.draw.getElementList()
+    const { startIndex, endIndex } = this.range.getRange()
+    const isCollapsed = startIndex === endIndex
+    // 首字符禁止删除
+    if (isCollapsed && elementList[startIndex].value === ZERO && startIndex === 0) {
+      return
+    }
+    if (!isCollapsed) {
+      elementList.splice(startIndex + 1, endIndex - startIndex)
+    } else {
+      elementList.splice(startIndex, 1)
+    }
+    const curIndex = isCollapsed ? startIndex - 1 : startIndex
+    this.range.setRange(curIndex, curIndex)
+    this.draw.render({ curIndex })
+  }
+
+  public setRange(startIndex: number, endIndex: number) {
+    if (startIndex < 0 || endIndex < 0 || endIndex < startIndex) return
+    this.range.setRange(startIndex, endIndex)
+    const isCollapsed = startIndex === endIndex
+    this.draw.render({
+      curIndex: isCollapsed ? startIndex : undefined,
+      isComputeRowList: false,
+      isSubmitHistory: false,
+      isSetCursor: isCollapsed
+    })
+  }
+
   public undo() {
     const isReadonly = this.draw.isReadonly()
     if (isReadonly) return
diff --git a/src/editor/core/event/CanvasEvent.ts b/src/editor/core/event/CanvasEvent.ts
index 9e351ce..74102dc 100644
--- a/src/editor/core/event/CanvasEvent.ts
+++ b/src/editor/core/event/CanvasEvent.ts
@@ -246,7 +246,7 @@ export class CanvasEvent {
     if (evt.key === KeyMap.Backspace) {
       if (isReadonly) return
       // 判断是否允许删除
-      if (elementList[index].value === ZERO && index === 0) {
+      if (isCollapsed && elementList[index].value === ZERO && index === 0) {
         evt.preventDefault()
         return
       }