diff --git a/packages/runtime-vapor/src/apiCreateVaporApp.ts b/packages/runtime-vapor/src/apiCreateVaporApp.ts
index 0f1afef78..31218c6b3 100644
--- a/packages/runtime-vapor/src/apiCreateVaporApp.ts
+++ b/packages/runtime-vapor/src/apiCreateVaporApp.ts
@@ -1,8 +1,9 @@
-import { isFunction, isObject } from '@vue/shared'
+import { NO, isFunction, isObject } from '@vue/shared'
 import {
   type Component,
   type ComponentInternalInstance,
   createComponentInstance,
+  validateComponentName,
 } from './component'
 import { warn } from './warning'
 import { version } from '.'
@@ -60,6 +61,20 @@ export function createVaporApp(
       return app
     },
 
+    component(name: string, component?: Component): any {
+      if (__DEV__) {
+        validateComponentName(name, context.config)
+      }
+      if (!component) {
+        return context.components[name]
+      }
+      if (__DEV__ && context.components[name]) {
+        warn(`Component "${name}" has already been registered in target app.`)
+      }
+      context.components[name] = component
+      return app
+    },
+
     mount(rootContainer): any {
       if (!instance) {
         instance = createComponentInstance(
@@ -119,10 +134,12 @@ export function createAppContext(): AppContext {
   return {
     app: null as any,
     config: {
+      isNativeTag: NO,
       errorHandler: undefined,
       warnHandler: undefined,
       globalProperties: {},
     },
+    components: {},
     provides: Object.create(null),
   }
 }
@@ -151,6 +168,11 @@ export interface App {
   ): this
   use<Options>(plugin: Plugin<Options>, options: Options): this
 
+  component(name: string): Component | undefined
+  // TODO: DefineComponent
+  // component<T extends Component | DefineComponent>(
+  component<T extends Component>(name: string, component: T): this
+
   mount(
     rootContainer: ParentNode | string,
     isHydrate?: boolean,
@@ -163,6 +185,9 @@ export interface App {
 }
 
 export interface AppConfig {
+  // @private
+  readonly isNativeTag: (tag: string) => boolean
+
   errorHandler?: (
     err: unknown,
     instance: ComponentInternalInstance | null,
@@ -179,6 +204,7 @@ export interface AppConfig {
 export interface AppContext {
   app: App // for devtools
   config: AppConfig
+  components: Record<string, Component>
   provides: Record<string | symbol, any>
 }
 
diff --git a/packages/runtime-vapor/src/component.ts b/packages/runtime-vapor/src/component.ts
index bb98adc85..b771d9b70 100644
--- a/packages/runtime-vapor/src/component.ts
+++ b/packages/runtime-vapor/src/component.ts
@@ -1,5 +1,5 @@
 import { EffectScope, isRef } from '@vue/reactivity'
-import { EMPTY_OBJ, hasOwn, isArray, isFunction } from '@vue/shared'
+import { EMPTY_OBJ, hasOwn, isArray, isFunction, makeMap } from '@vue/shared'
 import type { Block } from './apiRender'
 import type { DirectiveBinding } from './directives'
 import {
@@ -25,7 +25,11 @@ import {
 } from './componentSlots'
 import { VaporLifecycleHooks } from './apiLifecycle'
 import { warn } from './warning'
-import { type AppContext, createAppContext } from './apiCreateVaporApp'
+import {
+  type AppConfig,
+  type AppContext,
+  createAppContext,
+} from './apiCreateVaporApp'
 import type { Data } from '@vue/runtime-shared'
 
 export type Component = FunctionalComponent | ObjectComponent
@@ -362,6 +366,19 @@ export function createComponentInstance(
   return instance
 }
 
+const isBuiltInTag = /*#__PURE__*/ makeMap('slot,component')
+
+export function validateComponentName(
+  name: string,
+  { isNativeTag }: AppConfig,
+) {
+  if (isBuiltInTag(name) || isNativeTag(name)) {
+    warn(
+      'Do not use built-in or reserved HTML elements as component id: ' + name,
+    )
+  }
+}
+
 export function isVaporComponent(
   val: unknown,
 ): val is ComponentInternalInstance {