diff --git a/ccdi-project/src/main/java/com/ruoyi/ccdi/project/controller/CcdiFileUploadController.java b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/controller/CcdiFileUploadController.java
index 18d7776..3870664 100644
--- a/ccdi-project/src/main/java/com/ruoyi/ccdi/project/controller/CcdiFileUploadController.java
+++ b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/controller/CcdiFileUploadController.java
@@ -62,8 +62,10 @@ public class CcdiFileUploadController extends BaseController {
                 return AjaxResult.error("文件 " + file.getOriginalFilename() + " 超过50MB限制");
             }
             String fileName = file.getOriginalFilename();
-            if (!fileName.endsWith(".xlsx") && !fileName.endsWith(".xls")) {
-                return AjaxResult.error("文件 " + fileName + " 格式不支持，仅支持Excel文件");
+            String lowerFileName = fileName.toLowerCase();
+            if (!lowerFileName.endsWith(".xlsx") && !lowerFileName.endsWith(".xls")
+                    && !lowerFileName.endsWith(".csv") && !lowerFileName.endsWith(".pdf")) {
+                return AjaxResult.error("文件 " + fileName + " 格式不支持，仅支持 PDF、CSV、Excel 文件");
             }
         }