diff --git a/cmd/harmony/default.go b/cmd/harmony/default.go
index 986a2f7f6..86ed4226a 100644
--- a/cmd/harmony/default.go
+++ b/cmd/harmony/default.go
@@ -192,6 +192,7 @@ var defaultStagedSyncConfig = harmonyconfig.StagedSyncConfig{
 var (
 	defaultMainnetSyncConfig = harmonyconfig.SyncConfig{
 		Enabled:              false,
+		SyncMode:             0,
 		Downloader:           false,
 		StagedSync:           false,
 		StagedSyncCfg:        defaultStagedSyncConfig,
@@ -207,6 +208,7 @@ var (
 
 	defaultTestNetSyncConfig = harmonyconfig.SyncConfig{
 		Enabled:              true,
+		SyncMode:             0,
 		Downloader:           false,
 		StagedSync:           false,
 		StagedSyncCfg:        defaultStagedSyncConfig,
@@ -222,6 +224,7 @@ var (
 
 	defaultLocalNetSyncConfig = harmonyconfig.SyncConfig{
 		Enabled:              true,
+		SyncMode:             0,
 		Downloader:           true,
 		StagedSync:           true,
 		StagedSyncCfg:        defaultStagedSyncConfig,
@@ -237,6 +240,7 @@ var (
 
 	defaultPartnerSyncConfig = harmonyconfig.SyncConfig{
 		Enabled:              true,
+		SyncMode:             0,
 		Downloader:           true,
 		StagedSync:           false,
 		StagedSyncCfg:        defaultStagedSyncConfig,
@@ -252,6 +256,7 @@ var (
 
 	defaultElseSyncConfig = harmonyconfig.SyncConfig{
 		Enabled:              true,
+		SyncMode:             0,
 		Downloader:           true,
 		StagedSync:           false,
 		StagedSyncCfg:        defaultStagedSyncConfig,
diff --git a/cmd/harmony/main.go b/cmd/harmony/main.go
index 549237d1c..a29698f40 100644
--- a/cmd/harmony/main.go
+++ b/cmd/harmony/main.go
@@ -1005,6 +1005,7 @@ func setupStagedSyncService(node *node.Node, host p2p.Host, hc harmonyconfig.Har
 
 	sConfig := stagedstreamsync.Config{
 		ServerOnly:           !hc.Sync.Downloader,
+		SyncMode:             stagedstreamsync.SyncMode(hc.Sync.SyncMode),
 		Network:              nodeconfig.NetworkType(hc.Network.NetworkType),
 		Concurrency:          hc.Sync.Concurrency,
 		MinStreams:           hc.Sync.MinPeers,
diff --git a/internal/configs/harmony/harmony.go b/internal/configs/harmony/harmony.go
index 2fcb200c4..7ff250148 100644
--- a/internal/configs/harmony/harmony.go
+++ b/internal/configs/harmony/harmony.go
@@ -329,6 +329,7 @@ type PrometheusConfig struct {
 type SyncConfig struct {
 	// TODO: Remove this bool after stream sync is fully up.
 	Enabled              bool             // enable the stream sync protocol
+	SyncMode             uint32           // sync mode (default:Full sync, 1: Fast Sync, 2: Snap Sync(not implemented yet))
 	Downloader           bool             // start the sync downloader client
 	StagedSync           bool             // use staged sync
 	StagedSyncCfg        StagedSyncConfig // staged sync configurations