diff --git a/backend/src/main/resources/application.yml b/backend/src/main/resources/application.yml
index ad52294..f0c1db3 100644
--- a/backend/src/main/resources/application.yml
+++ b/backend/src/main/resources/application.yml
@@ -9,6 +9,8 @@ spring:
     multipart:
       max-file-size: 2048MB
       max-request-size: 2048MB
+      location: ./data/upload-temp  # 持久化临时目录，避免 Docker 容器重启丢失
+      file-size-threshold: 0  # 立即写入磁盘，不使用内存缓冲
   datasource:
     url: jdbc:h2:file:./data/sshmanager;DB_CLOSE_DELAY=-1
     driver-class-name: org.h2.Driver