diff --git a/docs/en/guide/schema.md b/docs/en/guide/schema.md
index 72a3a64..f19ac05 100644
--- a/docs/en/guide/schema.md
+++ b/docs/en/guide/schema.md
@@ -81,6 +81,7 @@ interface IElement {
     minWidth?: number;
     underline?: boolean;
     extension?: unknown;
+    deletable?: boolean;
     code: string | null;
     min?: number;
     max?: number;
diff --git a/docs/guide/schema.md b/docs/guide/schema.md
index 4617197..1c0ec9a 100644
--- a/docs/guide/schema.md
+++ b/docs/guide/schema.md
@@ -81,6 +81,7 @@ interface IElement {
     minWidth?: number;
     underline?: boolean;
     extension?: unknown;
+    deletable?: boolean;
     code: string | null;
     min?: number;
     max?: number;
diff --git a/src/editor/core/command/CommandAdapt.ts b/src/editor/core/command/CommandAdapt.ts
index ddbf967..fc0b97f 100644
--- a/src/editor/core/command/CommandAdapt.ts
+++ b/src/editor/core/command/CommandAdapt.ts
@@ -1945,6 +1945,7 @@ export class CommandAdapt {
     // 删除控件
     const control = this.draw.getControl()
     const newIndex = control.removeControl(startIndex)
+    if (newIndex === null) return
     // 重新渲染
     this.range.setRange(newIndex, newIndex)
     this.draw.render({
diff --git a/src/editor/core/draw/control/Control.ts b/src/editor/core/draw/control/Control.ts
index d50e00b..8dcbaf0 100644
--- a/src/editor/core/draw/control/Control.ts
+++ b/src/editor/core/draw/control/Control.ts
@@ -301,9 +301,11 @@ export class Control {
     }
   }
 
-  public removeControl(startIndex: number): number {
+  public removeControl(startIndex: number): number | null {
     const elementList = this.getElementList()
     const startElement = elementList[startIndex]
+    const { deletable = true } = startElement.control!
+    if (!deletable) return null
     let leftIndex = -1
     let rightIndex = -1
     // 向左查找
@@ -395,7 +397,7 @@ export class Control {
     return this.activeControl.setValue(data)
   }
 
-  public keydown(evt: KeyboardEvent): number {
+  public keydown(evt: KeyboardEvent): number | null {
     if (!this.activeControl) {
       throw new Error('active control is null')
     }
diff --git a/src/editor/core/draw/control/checkbox/CheckboxControl.ts b/src/editor/core/draw/control/checkbox/CheckboxControl.ts
index 2f4885a..63f8895 100644
--- a/src/editor/core/draw/control/checkbox/CheckboxControl.ts
+++ b/src/editor/core/draw/control/checkbox/CheckboxControl.ts
@@ -111,7 +111,7 @@ export class CheckboxControl implements IControlInstance {
     control!.code = data.join(',')
   }
 
-  public keydown(evt: KeyboardEvent): number {
+  public keydown(evt: KeyboardEvent): number | null {
     const range = this.control.getRange()
     // 收缩边界到Value内
     this.control.shrinkBoundary()
diff --git a/src/editor/core/draw/control/select/SelectControl.ts b/src/editor/core/draw/control/select/SelectControl.ts
index 0b439a6..141d688 100644
--- a/src/editor/core/draw/control/select/SelectControl.ts
+++ b/src/editor/core/draw/control/select/SelectControl.ts
@@ -78,7 +78,7 @@ export class SelectControl implements IControlInstance {
     return -1
   }
 
-  public keydown(evt: KeyboardEvent): number {
+  public keydown(evt: KeyboardEvent): number | null {
     const elementList = this.control.getElementList()
     const range = this.control.getRange()
     // 收缩边界到Value内
diff --git a/src/editor/core/draw/control/text/TextControl.ts b/src/editor/core/draw/control/text/TextControl.ts
index d95a95c..8e7ea0a 100644
--- a/src/editor/core/draw/control/text/TextControl.ts
+++ b/src/editor/core/draw/control/text/TextControl.ts
@@ -108,7 +108,7 @@ export class TextControl implements IControlInstance {
     return startIndex
   }
 
-  public keydown(evt: KeyboardEvent): number {
+  public keydown(evt: KeyboardEvent): number | null {
     const elementList = this.control.getElementList()
     const range = this.control.getRange()
     // 收缩边界到Value内
diff --git a/src/editor/core/event/handlers/keydown.ts b/src/editor/core/event/handlers/keydown.ts
index 8f94bd6..37cb033 100644
--- a/src/editor/core/event/handlers/keydown.ts
+++ b/src/editor/core/event/handlers/keydown.ts
@@ -28,7 +28,7 @@ export function keydown(evt: KeyboardEvent, host: CanvasEvent) {
   const activeControl = control.getActiveControl()
   if (evt.key === KeyMap.Backspace) {
     if (isReadonly || isPartRangeInControlOutside) return
-    let curIndex: number
+    let curIndex: number | null
     if (activeControl) {
       curIndex = control.keydown(evt)
     } else {
@@ -58,11 +58,12 @@ export function keydown(evt: KeyboardEvent, host: CanvasEvent) {
       }
       curIndex = isCollapsed ? index - 1 : startIndex
     }
+    if (curIndex === null) return
     rangeManager.setRange(curIndex, curIndex)
     draw.render({ curIndex })
   } else if (evt.key === KeyMap.Delete) {
     if (isReadonly || isPartRangeInControlOutside) return
-    let curIndex: number
+    let curIndex: number | null
     if (activeControl) {
       curIndex = control.keydown(evt)
     } else if (elementList[endIndex + 1]?.type === ElementType.CONTROL) {
@@ -79,6 +80,7 @@ export function keydown(evt: KeyboardEvent, host: CanvasEvent) {
       }
       curIndex = isCollapsed ? index : startIndex
     }
+    if (curIndex === null) return
     rangeManager.setRange(curIndex, curIndex)
     draw.render({ curIndex })
   } else if (evt.key === KeyMap.Enter) {
diff --git a/src/editor/interface/Control.ts b/src/editor/interface/Control.ts
index d592d08..035987f 100644
--- a/src/editor/interface/Control.ts
+++ b/src/editor/interface/Control.ts
@@ -21,6 +21,10 @@ export interface IControlCheckbox {
   checkbox?: ICheckbox
 }
 
+export interface IControlRule {
+  deletable?: boolean
+}
+
 export interface IControlBasic {
   type: ControlType
   value: IElement[] | null
@@ -34,6 +38,7 @@ export interface IControlBasic {
 }
 
 export type IControl = IControlBasic &
+  IControlRule &
   Partial<IControlSelect> &
   Partial<IControlCheckbox>
 
@@ -63,7 +68,7 @@ export interface IControlInstance {
 
   setValue(data: IElement[]): number
 
-  keydown(evt: KeyboardEvent): number
+  keydown(evt: KeyboardEvent): number | null
 
   cut(): number
 }