diff --git a/controller/channel.go b/controller/channel.go
index 8afc0eed..50b2b5f6 100644
--- a/controller/channel.go
+++ b/controller/channel.go
@@ -85,7 +85,7 @@ func AddChannel(c *gin.Context) {
 	}
 	channel.CreatedTime = common.GetTimestamp()
 	keys := strings.Split(channel.Key, "\n")
-	channels := make([]model.Channel, 0)
+	channels := make([]model.Channel, 0, len(keys))
 	for _, key := range keys {
 		if key == "" {
 			continue