diff --git a/xs.sh b/xs.sh
index d2cd075..aa4072f 100644
--- a/xs.sh
+++ b/xs.sh
@@ -8,7 +8,7 @@ LIMIT_RATE="3mbit"
 
 # 检查是否提供操作参数
 if [ "$#" -lt 1 ]; then
-    echo "Usage: $0 {add|delete}"
+    echo "Usage: $0 {add|del}"
     exit 1
 fi
 
@@ -16,17 +16,28 @@ fi
 add_limit() {
     echo "Adding bandwidth limit of $LIMIT_RATE on ports 8337 and 8338 for interface $INTERFACE..."
 
-    # 添加全局队列规则
+    # 添加全局队列规则（上行限制）
     tc qdisc add dev "$INTERFACE" root handle 1: htb default 11
     tc class add dev "$INTERFACE" parent 1: classid 1:1 htb rate "$LIMIT_RATE"
     tc class add dev "$INTERFACE" parent 1:1 classid 1:11 htb rate "$LIMIT_RATE"
 
-    # 针对端口 8337 添加过滤规则
+    # 针对端口 8337 上行流量添加过滤规则
     tc filter add dev "$INTERFACE" protocol ip parent 1:0 prio 1 u32 match ip dport 8337 0xffff flowid 1:11
 
-    # 针对端口 8338 添加过滤规则
+    # 针对端口 8338 上行流量添加过滤规则
     tc filter add dev "$INTERFACE" protocol ip parent 1:0 prio 1 u32 match ip dport 8338 0xffff flowid 1:11
 
+    # 添加全局队列规则（下行限制）
+    tc qdisc add dev ifb0 root handle 1: htb default 11
+    tc class add dev ifb0 parent 1: classid 1:1 htb rate "$LIMIT_RATE"
+    tc class add dev ifb0 parent 1:1 classid 1:11 htb rate "$LIMIT_RATE"
+
+    # 针对端口 8337 下行流量添加过滤规则
+    tc filter add dev ifb0 protocol ip parent 1:0 prio 1 u32 match ip sport 8337 0xffff flowid 1:11
+
+    # 针对端口 8338 下行流量添加过滤规则
+    tc filter add dev ifb0 protocol ip parent 1:0 prio 1 u32 match ip sport 8338 0xffff flowid 1:11
+
     echo "Bandwidth limit applied successfully."
 }
 
@@ -34,23 +45,33 @@ add_limit() {
 delete_limit() {
     echo "Removing bandwidth limit from interface $INTERFACE..."
 
-    # 删除队列规则
+    # 删除上行规则
     tc qdisc del dev "$INTERFACE" root
 
+    # 删除下行规则
+    tc qdisc del dev ifb0 root
+
     echo "Bandwidth limit removed successfully."
 }
 
 # 根据用户输入执行操作
 case "$1" in
     add)
+        # 启用下行流量接口 ifb0
+        modprobe ifb
+        ip link set ifb0 up
+
         add_limit
         ;;
     del)
         delete_limit
+
+        # 禁用下行流量接口 ifb0
+        ip link set ifb0 down
         ;;
     *)
         echo "Invalid option: $1"
-        echo "Usage: $0 {add|del}"
+        echo "Usage: $0 {add|delete}"
         exit 1
         ;;
 esac