diff --git a/server/api/conversation_routes.py b/server/api/conversation_routes.py
index 5319831..b95cf12 100644
--- a/server/api/conversation_routes.py
+++ b/server/api/conversation_routes.py
@@ -306,4 +306,26 @@ async def stop_generation_handler(message_id: str = None):
     message = (
         f"已发出停止指令，消息ID: {message_id}" if message_id else "已发出停止指令"
     )
-    return {"success": True, "message": message}
\ No newline at end of file
+    return {"success": True, "message": message}
+
+
+async def delete_attachment_handler(url: str):
+    """删除附件处理器 - 从 OSS 删除文件"""
+    try:
+        from utils.oss_uploader import delete_file, extract_object_key_from_url
+
+        object_key = extract_object_key_from_url(url)
+        if not object_key:
+            raise HTTPException(status_code=400, detail="无效的文件 URL")
+
+        success = delete_file(object_key)
+        if success:
+            return {"success": True, "message": "文件删除成功"}
+        else:
+            raise HTTPException(status_code=500, detail="文件删除失败")
+
+    except HTTPException:
+        raise
+    except Exception as e:
+        log_error(f"删除附件失败: {str(e)}")
+        raise HTTPException(status_code=500, detail=f"删除失败: {str(e)}")
\ No newline at end of file
diff --git a/server/main.py b/server/main.py
index 39cf28f..d4bdaaf 100644
--- a/server/main.py
+++ b/server/main.py
@@ -55,6 +55,7 @@ load_dotenv()
 
 # ── 会话管理路由处理器 ────────────────────────────────────────────────
 from api.conversation_routes import (add_message_handler,
+                                     delete_attachment_handler,
                                      delete_conversation_handler,
                                      get_conversation_handler,
                                      get_conversations_handler,
@@ -227,6 +228,11 @@ async def stop_generation_by_id(message_id: str):
     return await stop_generation_handler(message_id)
 
 
+@app.delete("/api/chat-ui/attachment")
+async def delete_attachment(url: str):
+    return await delete_attachment_handler(url)
+
+
 # ── 程序入口 ──────────────────────────────────────────────────────────
 if __name__ == "__main__":
     import uvicorn
diff --git a/src/components/chat/ChatMain.vue b/src/components/chat/ChatMain.vue
index a48f475..85f0eb0 100644
--- a/src/components/chat/ChatMain.vue
+++ b/src/components/chat/ChatMain.vue
@@ -28,6 +28,13 @@
 
     <!-- 输入区域 -->
     <div class="input-wrapper">
+      <!-- 附件预览区 -->
+      <div v-if="hasAttachments" class="attachments-preview-container">
+        <AttachmentPreview
+          :attachments="currentAttachments"
+          @remove="handleRemoveAttachment"
+        />
+      </div>
       <div class="input-container" :class="{ wide: isWideMode }">
         <ChatInput
           ref="chatInputRef"
@@ -56,6 +63,7 @@ import { useAuthStore } from "@/stores/auth";
 import ChatHeader from "./ChatHeader.vue";
 import MessageList from "./MessageList.vue";
 import ChatInput from "@/components/input/ChatInput.vue";
+import AttachmentPreview from "@/components/input/AttachmentPreview.vue";
 import { MessageType, MessageRole } from "@/types/chat";
 import type { Attachment, Suggestion } from "@/types/chat";
 import { chatApi, type ModelInfo } from "@/services/api";
@@ -119,6 +127,14 @@ const inputPlaceholder = computed(() => {
   return "输入你的问题，按 Ctrl+Enter 发送";
 });
 
+// 附件相关
+const currentAttachments = computed(() => chatInputRef.value?.attachments || []);
+const hasAttachments = computed(() => currentAttachments.value.length > 0);
+
+function handleRemoveAttachment(id: string) {
+  chatInputRef.value?.removeAttachment(id);
+}
+
 function toggleWideMode() {
   isWideMode.value = !isWideMode.value;
 }
@@ -513,6 +529,17 @@ watch(
   }
 }
 
+.attachments-preview-container {
+  margin-bottom: 12px;
+  background: #f3f4f5;
+  border-radius: 16px;
+  overflow: hidden;
+
+  .dark & {
+    background: #1e1e2e;
+  }
+}
+
 .input-container {
   width: 100%;
  // min-width: 1000px;
diff --git a/src/components/input/ChatInput.vue b/src/components/input/ChatInput.vue
index cac180f..2c43356 100644
--- a/src/components/input/ChatInput.vue
+++ b/src/components/input/ChatInput.vue
@@ -3,13 +3,6 @@
     class="chat-input-container"
     :class="{ 'is-focused': isFocused, 'is-expanded': isExpanded }"
   >
-    <!-- 附件预览区 -->
-    <AttachmentPreview
-      v-if="attachments.length > 0"
-      :attachments="attachments"
-      @remove="removeAttachment"
-    />
-
     <!-- 输入区域 -->
     <div class="input-area">
       <!-- 左侧功能按钮 -->
@@ -414,13 +407,28 @@ async function uploadFileToServer(id: string, file: File) {
 }
 
 // 移除附件
-function removeAttachment(id: string) {
+async function removeAttachment(id: string) {
   const index = attachments.value.findIndex((a) => a.id === id);
-  if (index !== -1) {
-    // 释放 blob URL
-    URL.revokeObjectURL(attachments.value[index].url);
-    attachments.value.splice(index, 1);
+  if (index === -1) return;
+
+  const attachment = attachments.value[index];
+
+  // 如果已上传到 OSS（不是本地 blob URL），则从 OSS 删除
+  if (attachment.url && !attachment.url.startsWith('blob:')) {
+    try {
+      await chatApi.deleteAttachment(attachment.url);
+    } catch (error) {
+      console.error('删除 OSS 文件失败:', error);
+      // 即使删除失败也继续移除本地引用
+    }
   }
+
+  // 释放 blob URL（如果是本地的）
+  if (attachment.url.startsWith('blob:')) {
+    URL.revokeObjectURL(attachment.url);
+  }
+
+  attachments.value.splice(index, 1);
 }
 
 // 切换功能（深度搜索与联网搜索互斥）
@@ -470,6 +478,8 @@ function clear() {
 defineExpose({
   focus,
   clear,
+  attachments,
+  removeAttachment,
 });
 
 // 监听文本变化，自动调整高度
diff --git a/src/services/api.ts b/src/services/api.ts
index 09827c2..982b8da 100644
--- a/src/services/api.ts
+++ b/src/services/api.ts
@@ -340,6 +340,23 @@ class ChatApi {
 
     return response.json();
   }
+
+  /**
+   * 删除附件（从 OSS 删除）
+   */
+  async deleteAttachment(url: string): Promise<void> {
+    const response = await fetch(
+      `${this.baseUrl}/api/chat-ui/attachment?url=${encodeURIComponent(url)}`,
+      {
+        method: "DELETE",
+        headers: getAuthHeaders(),
+      }
+    );
+
+    if (!response.ok) {
+      throw new Error(`删除附件失败: HTTP ${response.status}`);
+    }
+  }
 }
 
 // 导出单例