diff --git a/src/main/loader/index.ts b/src/main/loader/index.ts
index 2c6afa74..5c289632 100644
--- a/src/main/loader/index.ts
+++ b/src/main/loader/index.ts
@@ -11,8 +11,30 @@ import { DraftsExportLoader } from './draftsExportLoader'
 import { EpubLoader } from './epubLoader'
 import { OdLoader, OdType } from './odLoader'
 
-// embedjs内置loader类型
-const commonExts = ['.pdf', '.csv', '.docx', '.pptx', '.xlsx', '.md']
+// 文件扩展名到加载器类型的映射
+const FILE_LOADER_MAP: Record<string, string> = {
+  // 内置类型
+  '.pdf': 'common',
+  '.csv': 'common',
+  '.docx': 'common',
+  '.pptx': 'common',
+  '.xlsx': 'common',
+  '.md': 'common',
+  // OD类型
+  '.odt': 'od',
+  '.ods': 'od',
+  '.odp': 'od',
+  // epub类型
+  '.epub': 'epub',
+  // Drafts类型
+  '.draftsexport': 'drafts',
+  // HTML类型
+  '.html': 'html',
+  '.htm': 'html',
+  // JSON类型
+  '.json': 'json'
+  // 其他类型默认为文本类型
+}
 
 export async function addOdLoader(
   ragApplication: RAGApplication,
@@ -46,110 +68,87 @@ export async function addFileLoader(
   base: KnowledgeBaseParams,
   forceReload: boolean
 ): Promise<LoaderReturn> {
-  // 内置类型
-  if (commonExts.includes(file.ext)) {
-    const loaderReturn = await ragApplication.addLoader(
-      // @ts-ignore LocalPathLoader
-      new LocalPathLoader({ path: file.path, chunkSize: base.chunkSize, chunkOverlap: base.chunkOverlap }) as any,
-      forceReload
-    )
-    return {
-      entriesAdded: loaderReturn.entriesAdded,
-      uniqueId: loaderReturn.uniqueId,
-      uniqueIds: [loaderReturn.uniqueId],
-      loaderType: loaderReturn.loaderType
-    } as LoaderReturn
-  }
+  // 获取文件类型，如果没有匹配则默认为文本类型
+  const loaderType = FILE_LOADER_MAP[file.ext.toLowerCase()] || 'text'
+  let loaderReturn: AddLoaderReturn
 
-  // 自定义类型
-  if (['.odt', '.ods', '.odp'].includes(file.ext)) {
-    const loaderReturn = await addOdLoader(ragApplication, file, base, forceReload)
-    return {
-      entriesAdded: loaderReturn.entriesAdded,
-      uniqueId: loaderReturn.uniqueId,
-      uniqueIds: [loaderReturn.uniqueId],
-      loaderType: loaderReturn.loaderType
-    } as LoaderReturn
-  }
+  // JSON类型处理
+  let jsonObject = {}
+  let jsonParsed = true
+  Logger.info(`[KnowledgeBase] processing file ${file.path} as ${loaderType} type`)
+  switch (loaderType) {
+    case 'common':
+      // 内置类型处理
+      loaderReturn = await ragApplication.addLoader(
+        new LocalPathLoader({
+          path: file.path,
+          chunkSize: base.chunkSize,
+          chunkOverlap: base.chunkOverlap
+        }) as any,
+        forceReload
+      )
+      break
 
-  // epub 文件处理
-  if (file.ext === '.epub') {
-    const loaderReturn = await ragApplication.addLoader(
-      new EpubLoader({
-        filePath: file.path,
-        chunkSize: base.chunkSize ?? 1000,
-        chunkOverlap: base.chunkOverlap ?? 200
-      }) as any,
-      forceReload
-    )
-    return {
-      entriesAdded: loaderReturn.entriesAdded,
-      uniqueId: loaderReturn.uniqueId,
-      uniqueIds: [loaderReturn.uniqueId],
-      loaderType: loaderReturn.loaderType
-    } as LoaderReturn
-  }
+    case 'od':
+      // OD类型处理
+      loaderReturn = await addOdLoader(ragApplication, file, base, forceReload)
+      break
+    case 'epub':
+      // epub类型处理
+      loaderReturn = await ragApplication.addLoader(
+        new EpubLoader({
+          filePath: file.path,
+          chunkSize: base.chunkSize ?? 1000,
+          chunkOverlap: base.chunkOverlap ?? 200
+        }) as any,
+        forceReload
+      )
+      break
 
-  // DraftsExport类型 (file.ext会自动转换成小写)
-  if (['.draftsexport'].includes(file.ext)) {
-    const loaderReturn = await ragApplication.addLoader(new DraftsExportLoader(file.path) as any, forceReload)
-    return {
-      entriesAdded: loaderReturn.entriesAdded,
-      uniqueId: loaderReturn.uniqueId,
-      uniqueIds: [loaderReturn.uniqueId],
-      loaderType: loaderReturn.loaderType
-    }
-  }
+    case 'drafts':
+      // Drafts类型处理
+      loaderReturn = await ragApplication.addLoader(new DraftsExportLoader(file.path) as any, forceReload)
+      break
 
-  const fileContent = fs.readFileSync(file.path, 'utf-8')
+    case 'html':
+      // HTML类型处理
+      loaderReturn = await ragApplication.addLoader(
+        new WebLoader({
+          urlOrContent: fs.readFileSync(file.path, 'utf-8'),
+          chunkSize: base.chunkSize,
+          chunkOverlap: base.chunkOverlap
+        }) as any,
+        forceReload
+      )
+      break
 
-  // HTML类型
-  if (['.html', '.htm'].includes(file.ext)) {
-    const loaderReturn = await ragApplication.addLoader(
-      new WebLoader({
-        urlOrContent: fileContent,
-        chunkSize: base.chunkSize,
-        chunkOverlap: base.chunkOverlap
-      }) as any,
-      forceReload
-    )
-    return {
-      entriesAdded: loaderReturn.entriesAdded,
-      uniqueId: loaderReturn.uniqueId,
-      uniqueIds: [loaderReturn.uniqueId],
-      loaderType: loaderReturn.loaderType
-    }
-  }
-
-  // JSON类型
-  if (['.json'].includes(file.ext)) {
-    let jsonObject = {}
-    let jsonParsed = true
-    try {
-      jsonObject = JSON.parse(fileContent)
-    } catch (error) {
-      jsonParsed = false
-      Logger.warn('[KnowledgeBase] failed parsing json file, failling back to text processing:', file.path, error)
-    }
-    if (jsonParsed) {
-      const loaderReturn = await ragApplication.addLoader(new JsonLoader({ object: jsonObject }))
-      return {
-        entriesAdded: loaderReturn.entriesAdded,
-        uniqueId: loaderReturn.uniqueId,
-        uniqueIds: [loaderReturn.uniqueId],
-        loaderType: loaderReturn.loaderType
+    case 'json':
+      try {
+        jsonObject = JSON.parse(fs.readFileSync(file.path, 'utf-8'))
+      } catch (error) {
+        jsonParsed = false
+        Logger.warn('[KnowledgeBase] failed parsing json file, falling back to text processing:', file.path, error)
       }
-    }
+
+      if (jsonParsed) {
+        loaderReturn = await ragApplication.addLoader(new JsonLoader({ object: jsonObject }), forceReload)
+        break
+      }
+    // fallthrough - JSON 解析失败时作为文本处理
+    default:
+      // 文本类型处理（默认）
+      // 如果是其他文本类型且尚未读取文件，则读取文件
+      loaderReturn = await ragApplication.addLoader(
+        new TextLoader({
+          text: fs.readFileSync(file.path, 'utf-8'),
+          chunkSize: base.chunkSize,
+          chunkOverlap: base.chunkOverlap
+        }) as any,
+        forceReload
+      )
+      break
   }
 
-  // 文本类型
-  const loaderReturn = await ragApplication.addLoader(
-    new TextLoader({ text: fileContent, chunkSize: base.chunkSize, chunkOverlap: base.chunkOverlap }) as any,
-    forceReload
-  )
-
-  Logger.info('[KnowledgeBase] processing file', file.path)
-
   return {
     entriesAdded: loaderReturn.entriesAdded,
     uniqueId: loaderReturn.uniqueId,