diff --git a/ChangeLog b/ChangeLog
index 646cb1a..ea8ffd7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,7 +2,8 @@
 	* VERSION: 1.6.17
 	* BUGFIX: transaction syncing panic when target redis is cluster. see
 	#145.
-	* IMPROVE: set max `sender.count` to 4096 if target redis type is cluster.
+	* IMPROVE: adjust RecvChanSize based on `sender.count` or `scan.key_number`
+	if target redis type is cluster.
 2019-08-09 Alibaba Cloud.
 	* VERSION: 1.6.16
 	* BUGFIX: big key in `rump` mode all expired.
diff --git a/src/redis-shake/common/cluster.go b/src/redis-shake/common/cluster.go
index 8bf9df5..2abb1e7 100644
--- a/src/redis-shake/common/cluster.go
+++ b/src/redis-shake/common/cluster.go
@@ -7,7 +7,7 @@ import (
 	"pkg/libs/log"
 )
 
-const(
+var (
 	RecvChanSize = 4096
 )
 
diff --git a/src/redis-shake/main/main.go b/src/redis-shake/main/main.go
index a6fa959..ea58fc1 100644
--- a/src/redis-shake/main/main.go
+++ b/src/redis-shake/main/main.go
@@ -396,8 +396,9 @@ func sanitizeOptions(tp string) error {
 		// set to default when not set
 		conf.Options.SenderCount = defaultSenderCount
 	}
-	if conf.Options.TargetType == conf.RedisTypeCluster && conf.Options.SenderCount > utils.RecvChanSize {
-		conf.Options.SenderCount = utils.RecvChanSize
+	if conf.Options.TargetType == conf.RedisTypeCluster && int(conf.Options.SenderCount) > utils.RecvChanSize {
+		log.Infof("RecvChanSize is modified from [%v] to [%v]", utils.RecvChanSize, int(conf.Options.SenderCount))
+		utils.RecvChanSize = int(conf.Options.SenderCount)
 	}
 
 	if conf.Options.SenderDelayChannelSize == 0 {
@@ -451,8 +452,9 @@ func sanitizeOptions(tp string) error {
 				conf.Options.ScanSpecialCloud, conf.Options.ScanKeyFile)
 		}
 
-		if conf.Options.ScanKeyNumber > utils.RecvChanSize && conf.Options.TargetType == conf.RedisTypeCluster {
-			return fmt.Errorf("scan.key_number should less than [%v] when target type is cluster", utils.RecvChanSize)
+		if int(conf.Options.ScanKeyNumber) > utils.RecvChanSize && conf.Options.TargetType == conf.RedisTypeCluster {
+			log.Infof("RecvChanSize is modified from [%v] to [%v]", utils.RecvChanSize, int(conf.Options.ScanKeyNumber))
+			utils.RecvChanSize = int(conf.Options.ScanKeyNumber)
 		}
 
 		//if len(conf.Options.SourceAddressList) == 1 {