diff --git a/cloud-common-plugin/src/main/java/com/cm/common/plugin/service/file/impl/FileServiceImpl.java b/cloud-common-plugin/src/main/java/com/cm/common/plugin/service/file/impl/FileServiceImpl.java
index 24aef54..ffba6c7 100644
--- a/cloud-common-plugin/src/main/java/com/cm/common/plugin/service/file/impl/FileServiceImpl.java
+++ b/cloud-common-plugin/src/main/java/com/cm/common/plugin/service/file/impl/FileServiceImpl.java
@@ -642,6 +642,9 @@ public class FileServiceImpl extends AbstractService implements IFileService {
             case "apk":
                 contentType = "application/vnd.android.package-archive";
                 break;
+            case "pdf":
+                contentType = "application/pdf";
+                break;
             default:
                 contentType = "application/octet-stream";
         }