diff --git a/Dockerfile b/Dockerfile
index c886e8a..9737b10 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -38,9 +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 git; \
-    apt-get autoclean && rm -rf /var/lib/apt/lists/*
+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"]
 
diff --git a/start.sh b/start.sh
index 88435d5..502c1f1 100644
--- a/start.sh
+++ b/start.sh
@@ -1,24 +1,23 @@
 #!/bin/bash
 # 升级pip到最新
-python -m pip install --upgrade pip &&
-  CONTAINER_ALREADY_STARTED="CONTAINER_ALREADY_STARTED_PLACEHOLDER"
+python -m pip install --upgrade pip
+CONTAINER_ALREADY_STARTED="CONTAINER_ALREADY_STARTED_PLACEHOLDER"
 if [ ! -e $CONTAINER_ALREADY_STARTED ]; then
   echo "-- First container startup --"
+  touch $CONTAINER_ALREADY_STARTED
   # 此处插入你要执行的命令或者脚本文件
   git config --global init.defaultBranch master &&
     git init &&
     git remote add origin https://gitee.com/ngfchl/ptools &&
     # 设置拉取最新文件并覆盖
     git config pull.ff only &&
-    git pull origin master
-  ls -l && pwd; \
-    #    git branch --set-upstream-to=origin/master master &&
-    pip install -r requirements.txt; \
-    python manage.py makemigrations \
-    python manage.py migrate; \
-    python manage.py loaddata pt.json; \
-    touch $CONTAINER_ALREADY_STARTED;
-
+    git pull
+  git checkout master &&
+    git branch --set-upstream-to=origin/master master
+  pip install -r requirements.txt &&
+    python manage.py makemigrations &&
+    python manage.py migrate &&
+    python manage.py loaddata pt.json
   # 创建超级用户
   DJANGO_SUPERUSER_USERNAME=$DJANGO_SUPERUSER_USERNAME \
     DJANGO_SUPERUSER_EMAIL=$DJANGO_SUPERUSER_EMAIL \