diff --git a/docs/developer_guides/developer_guides.md b/docs/developer_guides/developer_guides.md
index f79aa11129..b28d507181 100644
--- a/docs/developer_guides/developer_guides.md
+++ b/docs/developer_guides/developer_guides.md
@@ -1207,9 +1207,14 @@ func newHardTimeTickBarrier(ctx context.Context, ttStream *MsgStream, peerIds []
 
 
  ```go
+type TimeTickBarrier interface {
+	GetTimeTick() (Timestamp,error)
+	Start() error
+}
+
 type timeSyncMsgProducer struct {
-  proxyTtBarrier *softTimeTickBarrier
-  WriteNodeTtBarrier *hardTimeTickBarrier
+  proxyTtBarrier TimeTickBarrier // softTimeTickBarrier
+  WriteNodeTtBarrier TimeTickBarrier //hardTimeTickBarrier
   
   dmSyncStream *MsgStream // insert & delete
   k2sSyncStream *MsgStream
diff --git a/internal/master/timesync/timesync.go b/internal/master/timesync/timesync.go
index baadb1bd4b..ce11cd1955 100644
--- a/internal/master/timesync/timesync.go
+++ b/internal/master/timesync/timesync.go
@@ -8,8 +8,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/zilliztech/milvus-distributed/internal/util/typeutil"
-
 	"github.com/zilliztech/milvus-distributed/internal/conf"
 
 	"github.com/apache/pulsar-client-go/pulsar"
@@ -17,9 +15,6 @@ import (
 	"github.com/zilliztech/milvus-distributed/internal/proto/internalpb"
 )
 
-type UniqueID = typeutil.UniqueID
-type Timestamp = typeutil.Timestamp
-
 const stopReadFlagId int64 = -1
 
 type TimeTickReader struct {
diff --git a/internal/master/timesync/timetick.go b/internal/master/timesync/timetick.go
new file mode 100644
index 0000000000..68ec760ca5
--- /dev/null
+++ b/internal/master/timesync/timetick.go
@@ -0,0 +1,11 @@
+package timesync
+
+import "github.com/zilliztech/milvus-distributed/internal/util/typeutil"
+
+type UniqueID = typeutil.UniqueID
+type Timestamp = typeutil.Timestamp
+
+type TimeTickBarrier interface {
+	GetTimeTick() (Timestamp,error)
+	Start() error
+}