diff --git a/tool/aptss b/tool/aptss
index 15d96a5..e246557 100755
--- a/tool/aptss
+++ b/tool/aptss
@@ -18,7 +18,7 @@ fi
 
 
 
-if  [ "$1" = "install" ] || [ "$1" = "upgrade" ] || [ "$1" = "full-upgrade" ] || [ "$1" = "download" ] ; then
+if  [ "$1" = "install" ] || [ "$1" = "upgrade" ] || [ "$1" = "full-upgrade" ] ; then
 
 DEPEND=`which  apt-fast`
 if [ "$DEPEND" = "" ] ; then 
@@ -35,6 +35,20 @@ bwrap --dev-bind / / \
                 apt-fast "$@" --allow-downgrades 
 
 
+elif [ "$1" = "download" ];then
+DEPEND=`which  apt-fast`
+if [ "$DEPEND" = "" ] ; then 
+echo "未安装依赖：apt-fast 开始安装"
+aptss ssupdate && bwrap --dev-bind / / --bind '/opt/durapps/spark-store/bin/apt-fast-conf/sources.list.d/sparkstore.list' /etc/apt/sources.list.d/sparkstore.list apt install apt-fast -y 
+fi
+
+###执行
+bwrap --dev-bind / / \
+                   --bind '/tmp/aptss-conf/apt-fast.conf' /etc/apt-fast.conf \
+                   --bind '/opt/durapps/spark-store/bin/apt-fast-conf/sources.list.d/sparkstore.list' /etc/apt/sources.list.d/sparkstore.list \
+                apt-fast "$@" --allow-downgrades 
+
+
 elif [ "$1" = "policy" ] || [ "$1" = "search" ];then
 sudo bwrap --dev-bind / / --bind '/opt/durapps/spark-store/bin/apt-fast-conf/sources.list.d/sparkstore.list' /etc/apt/sources.list.d/sparkstore.list apt update -o Dir::Etc::sourcelist="sources.list.d/sparkstore.list"  -o Dir::etc::sourceparts="-" -o APT::Get::List-Cleanup="0"