diff --git a/docs/components/ai-chat-composer.md b/docs/components/ai-chat-composer.md
index 1d68a95..3bc5c72 100644
--- a/docs/components/ai-chat-composer.md
+++ b/docs/components/ai-chat-composer.md
@@ -1,6 +1,6 @@
 # AiChatComposer 输入框
 
-对话输入框，按状态在发送、停止、重试与新开会话之间切换。
+对话输入框采用上下布局：整行文本域下方提供新开会话、添加附件和发送或停止操作。
 
 ## 基础用法
 
@@ -14,16 +14,17 @@ demo-preview=../demos/ai-chat-composer/basic.vue
 
 需要单独摆放输入框时使用。多数情况下直接用 [AiChatPanel](/components/ai-chat-panel) 更省事。
 
-## 三种按钮形态
+## 输入区与操作按钮
+
+文本域占满整行并随内容自动增高。下一行左侧是新开会话（`chat-add`）和添加附件（`file-add`），右侧根据状态显示纯文本发送或停止按钮。
 
 | 状态 | 按钮 |
 | --- | --- |
-| 空闲且未禁用 | 新开会话（`chat-add`） |
-| 默认 | 发送（`sendText`） |
+| 空闲且未禁用 | 新开会话、添加附件、发送（`sendText`） |
 | `isGenerating` 为真 | 停止（`stopText`，危险色） |
 | 有 `lastError` 且 `canRetry` | 错误条 + 重试（`retryText`） |
 
-生成中或 `disabled` 为真时输入框不可编辑，新开会话和 `send` 事件也不会触发。
+生成中或 `disabled` 为真时输入框不可编辑，新开会话、添加附件和 `send` 事件不会触发。
 
 ## 事件
 
@@ -31,6 +32,7 @@ demo-preview=../demos/ai-chat-composer/basic.vue
 - `stop`：点停止按钮
 - `retry`：点错误条上的重试
 - `new-conversation`：清空输入框并请求业务侧开始一个新会话
+- `add-attachment`：请求业务侧添加附件
 
 输入框内容用 `v-model` 绑定，`maxLength` 默认 2000。
 
diff --git a/docs/components/ai-chat-panel.md b/docs/components/ai-chat-panel.md
index ba4a27d..c54c9b2 100644
--- a/docs/components/ai-chat-panel.md
+++ b/docs/components/ai-chat-panel.md
@@ -28,6 +28,10 @@ const {
 } = useAiChat({
 	request: ({ message, signal }) => fetchReply(message, signal)
 });
+
+function selectAttachment() {
+	// 在业务侧打开文件选择器
+}
 </script>
 
 <template>
@@ -41,6 +45,7 @@ const {
 		@stop="stopGeneration"
 		@retry="retryLastMessage"
 		@new-conversation="resetConversation"
+		@add-attachment="selectAttachment"
 	/>
 </template>
 ```
@@ -64,7 +69,7 @@ const {
 
 ## 自定义
 
-`welcome`、`composer`、`tool-status`、`message` 等插槽可以替换对应区域。`composer` 插槽会拿到 `draft`、`on-send`、`on-stop`、`on-retry`、`on-new-conversation` 等，便于接入自定义输入框。
+`welcome`、`composer`、`tool-status`、`message` 等插槽可以替换对应区域。`composer` 插槽会拿到 `draft`、`on-send`、`on-stop`、`on-retry`、`on-new-conversation`、`on-add-attachment` 等，便于接入自定义输入框。
 
 ## API
 
diff --git a/docs/demos/ai-chat-composer/basic.vue b/docs/demos/ai-chat-composer/basic.vue
index 94ba586..f72be13 100644
--- a/docs/demos/ai-chat-composer/basic.vue
+++ b/docs/demos/ai-chat-composer/basic.vue
@@ -9,6 +9,7 @@
 			@stop="onStop"
 			@retry="onRetry"
 			@new-conversation="onNewConversation"
+			@add-attachment="onAddAttachment"
 		/>
 
 		<div class="bar">
@@ -59,6 +60,10 @@ function onNewConversation() {
 	error.value = "";
 	push("new-conversation()");
 }
+
+function onAddAttachment() {
+	push("add-attachment()");
+}
 </script>
 
 <style lang="less" scoped>
diff --git a/src/assets/style/tdesign-custom.less b/src/assets/style/tdesign-custom.less
index 344f683..729a37d 100644
--- a/src/assets/style/tdesign-custom.less
+++ b/src/assets/style/tdesign-custom.less
@@ -24,6 +24,10 @@
 .t-form {
 	.cellStyle();
 
+	&.card {
+		border-radius: 1rem;
+	}
+
 	.t-form__item {
 		padding: @cellPadding;
 
diff --git a/src/components/ai/AiChatComposer.vue b/src/components/ai/AiChatComposer.vue
index 47adf4e..b85ffa4 100644
--- a/src/components/ai/AiChatComposer.vue
+++ b/src/components/ai/AiChatComposer.vue
@@ -12,28 +12,46 @@
 				/>
 			</slot>
 		</div>
-		<div class="input-wrap">
-			<t-button
-				type="button"
-				theme="primary"
-				shape="circle"
-				aria-label="新开会话"
+		<t-form class="form glass-white" @submit="submitMessage">
+			<t-textarea
+				v-model="draft"
+				class="input"
+				:autosize="{ minRows: 3, maxRows: 6 }"
 				:disabled="props.isGenerating || props.disabled"
-				@click="startNewConversation"
-			>
-				<template #icon>
-					<t-icon name="chat-add" />
-				</template>
-			</t-button>
-			<t-form class="form glass-white" @submit="submitMessage">
-				<t-input
-					v-model="draft"
-					class="input bg-transparent"
-					borderless
-					:disabled="props.isGenerating || props.disabled"
-					:maxlength="props.maxLength"
-					:placeholder="props.placeholder"
-				/>
+				:maxlength="props.maxLength"
+				:placeholder="props.placeholder"
+			/>
+			<div class="actions">
+				<div class="tools">
+					<t-button
+						class="tool"
+						type="button"
+						size="extra-small"
+						variant="outline"
+						aria-label="新会话"
+						content="新会话"
+						:disabled="props.isGenerating || props.disabled"
+						@click="startNewConversation"
+					>
+						<template #icon>
+							<t-icon name="chat-add" size="small" />
+						</template>
+					</t-button>
+					<t-button
+						class="tool"
+						type="button"
+						size="extra-small"
+						variant="outline"
+						aria-label="上传附件"
+						content="上传附件"
+						:disabled="props.isGenerating || props.disabled"
+						@click="addAttachment"
+					>
+						<template #icon>
+							<t-icon name="file-add" size="small" />
+						</template>
+					</t-button>
+				</div>
 				<slot
 					v-if="props.isGenerating"
 					name="stop"
@@ -43,8 +61,9 @@
 					<t-button
 						class="send"
 						type="button"
-						size="small"
+						size="extra-small"
 						theme="danger"
+						:disabled="props.disabled"
 						:content="props.stopText"
 						@click="emit('stop')"
 					/>
@@ -58,14 +77,14 @@
 					<t-button
 						class="send"
 						type="submit"
-						size="small"
+						size="extra-small"
 						theme="primary"
 						:disabled="props.disabled"
 						:content="props.sendText"
 					/>
 				</slot>
-			</t-form>
-		</div>
+			</div>
+		</t-form>
 	</div>
 </template>
 
@@ -103,6 +122,7 @@ const emit = defineEmits<{
 	stop: [];
 	retry: [];
 	"new-conversation": [];
+	"add-attachment": [];
 }>();
 
 function startNewConversation(): void {
@@ -113,6 +133,13 @@ function startNewConversation(): void {
 	emit("new-conversation");
 }
 
+function addAttachment(): void {
+	if (props.disabled || props.isGenerating) {
+		return;
+	}
+	emit("add-attachment");
+}
+
 function submitMessage(): void {
 	if (props.disabled || props.isGenerating) {
 		return;
@@ -152,35 +179,42 @@ function submitMessage(): void {
 		}
 	}
 
-	.input-wrap {
+	.form {
+		--td-textarea-background-color: transparent;
 
-		gap: .75rem;
+		border: 1px solid var(--td-component-border);
 		margin: .5rem 0 0;
 		display: flex;
-		align-items: center;
+		padding: .5rem;
+		box-shadow: 0 .5rem 1.5rem rgba(15, 23, 42, .12);
+		align-items: stretch;
+		border-radius: 1.25rem;
+		flex-direction: column;
 
-		.form {
-			--td-input-bg-color: transparent;
-			--td-button-border-radius: 1rem;
+		.input {
+			flex: 1;
+			width: 100%;
+			padding: 0 .25rem;
+			min-width: 0;
+		}
+
+		.actions {
+			--td-button-border-radius: .75rem;
 
 			gap: .5rem;
-			flex: 1;
-			border: 1px solid var(--td-component-border);
-			margin: 0;
+			margin-top: .375rem;
 			display: flex;
-			padding: .25rem .25rem .25rem .75rem;
-			box-shadow: 0 .5rem 1.5rem rgba(15, 23, 42, .12);
 			align-items: center;
-			border-radius: 1.25rem;
+			justify-content: space-between;
 
-			.input {
-				flex: 1;
-				min-width: 0;
+			.tools {
+				gap: .5rem;
+				display: flex;
+				align-items: center;
 			}
 
 			.send {
-				width: 4rem;
-				flex: none;
+				padding: 0 1rem;
 			}
 		}
 	}
diff --git a/src/components/ai/AiChatMessageList.vue b/src/components/ai/AiChatMessageList.vue
index a720ad6..884949b 100644
--- a/src/components/ai/AiChatMessageList.vue
+++ b/src/components/ai/AiChatMessageList.vue
@@ -90,7 +90,7 @@ import type {
 	AiChatMessage,
 	AiChatMessageStatusFormatter,
 	AiChatRoleNameFormatter,
-	AiChatRoleNames,
+	AiChatRoleNames
 } from "./types";
 
 defineOptions({
@@ -170,11 +170,13 @@ defineExpose({
 <style scoped lang="less">
 .message-list {
 	gap: 1rem;
-	flex: 1;
+	flex: none;
+	height: 100%;
 	display: flex;
-	padding: .5rem 1rem calc(6rem + env(safe-area-inset-bottom, 0px));
+	padding: var(--ai-msg-padding-top, .5rem) 1rem calc(var(--ai-chat-bottom-area-height, 4.5rem) + 1.5rem + env(safe-area-inset-bottom, 0px));
 	min-width: 0;
 	min-height: 0;
+	box-sizing: border-box;
 	overflow-y: auto;
 	overflow-x: hidden;
 	flex-direction: column;
diff --git a/src/components/ai/AiChatPanel.vue b/src/components/ai/AiChatPanel.vue
index 3e59bab..9ddb96d 100644
--- a/src/components/ai/AiChatPanel.vue
+++ b/src/components/ai/AiChatPanel.vue
@@ -2,6 +2,7 @@
 	<section class="ai-chat-panel" :aria-label="props.ariaLabel">
 		<ai-chat-message-list
 			ref="messageList"
+			:style="messageListStyle"
 			:messages="props.messages"
 			:is-generating="props.isGenerating"
 			:loading="props.isLoading"
@@ -40,7 +41,7 @@
 			</template>
 		</ai-chat-message-list>
 
-		<div class="bottom-area">
+		<div ref="bottomArea" class="bottom-area">
 			<slot name="tool-status" :status="props.activeToolStatus">
 				<div v-if="props.activeToolStatus" class="tool-status">
 					<t-icon name="loading" size="1rem" />
@@ -58,6 +59,7 @@
 				:on-stop="() => emit('stop')"
 				:on-retry="() => emit('retry')"
 				:on-new-conversation="() => emit('new-conversation')"
+				:on-add-attachment="() => emit('add-attachment')"
 			>
 				<ai-chat-composer
 					v-model="draft"
@@ -74,6 +76,7 @@
 					@stop="emit('stop')"
 					@retry="emit('retry')"
 					@new-conversation="emit('new-conversation')"
+					@add-attachment="emit('add-attachment')"
 				/>
 			</slot>
 		</div>
@@ -81,7 +84,7 @@
 </template>
 
 <script setup lang="ts">
-import { shallowRef, useTemplateRef } from "vue";
+import { computed, onBeforeUnmount, onMounted, ref, shallowRef, useTemplateRef } from "vue";
 import type {
 	AiChatMessage,
 	AiChatMessageStatusFormatter,
@@ -144,10 +147,23 @@ const emit = defineEmits<{
 	stop: [];
 	retry: [];
 	"new-conversation": [];
+	"add-attachment": [];
 }>();
 
 const messageListRef = useTemplateRef<{ scrollToBottom: () => Promise<void> }>("messageList");
+const bottomAreaRef = useTemplateRef<HTMLElement>("bottomArea");
+const bottomAreaHeight = ref<number>();
 const draft = shallowRef("");
+let bottomAreaObserver: ResizeObserver | undefined;
+
+const messageListStyle = computed(() => {
+	if (bottomAreaHeight.value === undefined) {
+		return {};
+	}
+	return {
+		"--ai-chat-bottom-area-height": `${bottomAreaHeight.value}px`
+	};
+});
 
 function submitMessage(message: string): void {
 	emit("send", message);
@@ -157,6 +173,23 @@ async function scrollToBottom(): Promise<void> {
 	await messageListRef.value?.scrollToBottom();
 }
 
+onMounted(() => {
+	const bottomArea = bottomAreaRef.value;
+	if (!bottomArea) {
+		return;
+	}
+	const updateBottomAreaHeight = () => {
+		bottomAreaHeight.value = Math.ceil(bottomArea.getBoundingClientRect().height);
+	};
+	updateBottomAreaHeight();
+	bottomAreaObserver = new ResizeObserver(updateBottomAreaHeight);
+	bottomAreaObserver.observe(bottomArea);
+});
+
+onBeforeUnmount(() => {
+	bottomAreaObserver?.disconnect();
+});
+
 defineExpose({
 	scrollToBottom
 });
@@ -188,6 +221,8 @@ defineExpose({
 		z-index: 2;
 		position: absolute;
 		max-width: 40rem;
+		display: flex;
+		flex-direction: column;
 
 		.tool-status {
 			gap: .375rem;