I'm coding a custom validation form component using ant-design-vue

I have changed my code nearly same as the example showed on the official website, but still got warning, the only difference is the example use template to define child component, but I use single vue file

//parent component
...some other code

  

...some other code

//child component

I expect everything is fine, but the actual is I got 'Warning: getFieldDecorator will override value, so please don't set value and v-model directly and use setFieldsValue to set it.'

How can I fix it? Thanks in advance