diff --git a/app/components/dify-dataset-manager/document-upload.tsx b/app/components/dify-dataset-manager/document-upload.tsx
index b7467c3..4b39b8d 100644
--- a/app/components/dify-dataset-manager/document-upload.tsx
+++ b/app/components/dify-dataset-manager/document-upload.tsx
@@ -22,14 +22,16 @@ import {
     Spin,
     Tooltip,
     Upload,
+    message,
 } from 'antd';
 import { useEffect, useState } from 'react';
 import type { Segment } from '~/api/dify-dataset/type';
 import { useDocumentUpload } from '~/hooks/dify-dataset-manager/document-upload';
 import type { DocumentUploadProps, UploadedDocument } from '~/types/dify-dataset-manager/document-upload';
-import { SUPPORTED_FORMATS } from '~/types/dify-dataset-manager/document-upload';
+import { SUPPORTED_ACCEPT, SUPPORTED_FILE_EXTENSIONS, SUPPORTED_FORMATS } from '~/types/dify-dataset-manager/document-upload';
 
 const { Dragger } = Upload;
+const MAX_FILE_SIZE_MB = 15;
 
 /**
  * 文档上传组件
@@ -121,9 +123,24 @@ export default function DocumentUpload({
                 <Dragger
                     fileList={fileList}
                     onChange={handleFileChange}
-                    beforeUpload={() => false}
+                    beforeUpload={(file) => {
+                        const lowerName = file.name.toLowerCase();
+                        const isSupported = SUPPORTED_FILE_EXTENSIONS.some((ext) => lowerName.endsWith(ext));
+                        if (!isSupported) {
+                            message.error(`仅支持上传 ${SUPPORTED_FORMATS} 格式的文件`);
+                            return Upload.LIST_IGNORE;
+                        }
+
+                        const isWithinLimit = file.size / 1024 / 1024 <= MAX_FILE_SIZE_MB;
+                        if (!isWithinLimit) {
+                            message.error(`单个文件大小不能超过 ${MAX_FILE_SIZE_MB}MB`);
+                            return Upload.LIST_IGNORE;
+                        }
+
+                        return false;
+                    }}
                     multiple={true}
-                    accept=".txt,.md,.mdx,.pdf,.html,.htm,.xlsx,.xls,.docx,.csv,.vtt,.properties"
+                    accept={SUPPORTED_ACCEPT}
                     showUploadList={false}
                 >
                     <p className="ant-upload-drag-icon">
diff --git a/app/types/dify-dataset-manager/document-upload.ts b/app/types/dify-dataset-manager/document-upload.ts
index aaf8fbb..541e7ce 100644
--- a/app/types/dify-dataset-manager/document-upload.ts
+++ b/app/types/dify-dataset-manager/document-upload.ts
@@ -65,7 +65,9 @@ export const INDEXING_STATUS_CONFIG: Record<IndexingStatus, { text: string; perc
 /**
  * 支持的文件格式
  */
-export const SUPPORTED_FORMATS = 'TXT, MARKDOWN, MDX, PDF, HTML, XLSX, XLS, DOCX, CSV, VTT, PROPERTIES, MD, HTM';
+export const SUPPORTED_FILE_EXTENSIONS = ['.pdf', '.docx', '.md', '.txt'] as const;
+export const SUPPORTED_FORMATS = 'PDF, DOCX, MD, TXT';
+export const SUPPORTED_ACCEPT = SUPPORTED_FILE_EXTENSIONS.join(',');
 
 /**
  * 文档上传组件 Props