diff --git a/Dockerfile b/Dockerfile
index 8853fa0..9737b10 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -38,10 +38,7 @@ ADD ./start.sh /var/www/html
 RUN chmod +x /var/www/html/start.sh
 
 # 更换USTC源，并安装gcc，git
-RUN sed -i 's/deb.debian.org/mirrors.ustc.edu.cn/g' /etc/apt/sources.list &&
-  apt update &&
-    yes|apt install gcc git &&
-     apt-get autoclean
+RUN sed -i 's/deb.debian.org/mirrors.ustc.edu.cn/g' /etc/apt/sources.list && apt update && yes|apt install gcc git &&     apt-get autoclean
 
 VOLUME ["/var/www/html/ptools"]