diff --git a/packages/frontend/core/src/blocksuite/presets/ai/peek-view/chat-block-input.ts b/packages/frontend/core/src/blocksuite/presets/ai/peek-view/chat-block-input.ts
index d7c9d5806..98f3bc552 100644
--- a/packages/frontend/core/src/blocksuite/presets/ai/peek-view/chat-block-input.ts
+++ b/packages/frontend/core/src/blocksuite/presets/ai/peek-view/chat-block-input.ts
@@ -362,6 +362,7 @@ export class ChatBlockInput extends LitElement {
     const { doc } = this.host;
     this.textarea.value = '';
     this._isInputEmpty = true;
+    this.textarea.style.height = 'unset';
     this.updateContext({
       images: [],
       status: 'loading',