diff --git a/packages/form/src/extensions/textarea.vue b/packages/form/src/extensions/textarea.vue
index 60594ce..9254a28 100644
--- a/packages/form/src/extensions/textarea.vue
+++ b/packages/form/src/extensions/textarea.vue
@@ -8,10 +8,9 @@
     <div class="bottom">
       <el-input
         type="textarea"
+        v-model="config"
         :autosize="autosize"
         :disabled="disabled"
-        :modelValue="modelValue"
-        @update:modelValue="$emit('update:modelValue', $event)"
       ></el-input>
     </div>
   </schema-base>
@@ -20,7 +19,7 @@
 <script lang="ts" setup>
 
 import { computed, PropType } from 'vue'
-import { Schema } from '../utils'
+import { Schema, useModel } from '../utils'
 import SchemaBase from '../base.vue'
 
 const props = defineProps({
@@ -33,6 +32,8 @@ const props = defineProps({
 
 defineEmits(['update:modelValue'])
 
+const config = useModel()
+
 const autosize = computed(() => {
   const { rows } = props.schema.meta.extra || {}
   if (typeof rows === 'number') return { minRows: rows, maxRows: rows }
diff --git a/packages/form/src/utils.ts b/packages/form/src/utils.ts
index 4dd89ec..95e18d7 100644
--- a/packages/form/src/utils.ts
+++ b/packages/form/src/utils.ts
@@ -44,21 +44,23 @@ export function inferFallback(schema: Schema) {
 
 function optional(schema: Schema): Schema {
   if (schema.type === 'const') return schema
+  schema = new Schema(schema)
   if (schema.type === 'object') {
-    return Schema.object(valueMap(schema.dict, optional))
+    schema.dict = valueMap(schema.dict, optional)
   } else if (schema.type === 'tuple') {
-    return Schema.tuple(schema.list.map(optional))
+    schema.list = schema.list.map(optional)
   } else if (schema.type === 'intersect') {
-    return Schema.intersect(schema.list.map(optional))
+    schema.list = schema.list.map(optional)
   } else if (schema.type === 'union') {
-    return Schema.union(schema.list.map(optional))
+    schema.list = schema.list.map(optional)
   } else if (schema.type === 'dict') {
-    return Schema.dict(optional(schema.inner))
+    schema.inner = optional(schema.inner)
   } else if (schema.type === 'array') {
-    return Schema.array(optional(schema.inner))
+    schema.inner = optional(schema.inner)
   } else {
-    return Schema(schema).required(false)
+    schema.meta.required = false
   }
+  return schema
 }
 
 export function check(schema: any, value: any) {