diff --git a/cmd/harmony/config.go b/cmd/harmony/config.go
index 8ac68238b..057db6293 100644
--- a/cmd/harmony/config.go
+++ b/cmd/harmony/config.go
@@ -60,7 +60,8 @@ type generalConfig struct {
 }
 
 type consensusConfig struct {
-	MinPeers int
+	MinPeers     int
+	AggregateSig bool
 }
 
 type blsConfig struct {
diff --git a/cmd/harmony/default.go b/cmd/harmony/default.go
index b63ddf879..5a4e92247 100644
--- a/cmd/harmony/default.go
+++ b/cmd/harmony/default.go
@@ -89,7 +89,8 @@ var defaultLogContext = logContext{
 }
 
 var defaultConsensusConfig = consensusConfig{
-	MinPeers: 6,
+	MinPeers:     6,
+	AggregateSig: true,
 }
 
 const (
diff --git a/cmd/harmony/flags.go b/cmd/harmony/flags.go
index 5a063926e..25a246248 100644
--- a/cmd/harmony/flags.go
+++ b/cmd/harmony/flags.go
@@ -92,6 +92,7 @@ var (
 	// consensusValidFlags are flags that are effective
 	consensusValidFlags = []cli.Flag{
 		consensusMinPeersFlag,
+		consensusAggregateSigFlag,
 		legacyConsensusMinPeersFlag,
 	}
 
@@ -746,6 +747,11 @@ var (
 		DefValue: defaultConsensusConfig.MinPeers,
 		Hidden:   true,
 	}
+	consensusAggregateSigFlag = cli.BoolFlag{
+		Name:     "consensus.aggregate-sig",
+		Usage:    "(multi-key) aggregate bls signatures before sending",
+		DefValue: defaultConsensusConfig.AggregateSig,
+	}
 	legacyDelayCommitFlag = cli.StringFlag{
 		Name:       "delay_commit",
 		Usage:      "how long to delay sending commit messages in consensus, ex: 500ms, 1s",
@@ -766,7 +772,7 @@ var (
 )
 
 func applyConsensusFlags(cmd *cobra.Command, config *harmonyConfig) {
-	if cli.HasFlagsChanged(cmd, consensusValidFlags) {
+	if config.Consensus == nil && cli.HasFlagsChanged(cmd, consensusValidFlags) {
 		cfg := getDefaultConsensusConfigCopy()
 		config.Consensus = &cfg
 	}
@@ -776,6 +782,10 @@ func applyConsensusFlags(cmd *cobra.Command, config *harmonyConfig) {
 	} else if cli.IsFlagChanged(cmd, legacyConsensusMinPeersFlag) {
 		config.Consensus.MinPeers = cli.GetIntFlagValue(cmd, legacyConsensusMinPeersFlag)
 	}
+
+	if cli.IsFlagChanged(cmd, consensusAggregateSigFlag) {
+		config.Consensus.AggregateSig = cli.GetBoolFlagValue(cmd, consensusAggregateSigFlag)
+	}
 }
 
 // transaction pool flags
diff --git a/cmd/harmony/flags_test.go b/cmd/harmony/flags_test.go
index 8194e8334..bf82335b9 100644
--- a/cmd/harmony/flags_test.go
+++ b/cmd/harmony/flags_test.go
@@ -67,7 +67,8 @@ func TestHarmonyFlags(t *testing.T) {
 					Port:    9800,
 				},
 				Consensus: &consensusConfig{
-					MinPeers: 6,
+					MinPeers:     6,
+					AggregateSig: true,
 				},
 				BLSKeys: blsConfig{
 					KeyDir:           "./.hmy/blskeys",
@@ -600,15 +601,18 @@ func TestConsensusFlags(t *testing.T) {
 			expConfig: nil,
 		},
 		{
-			args: []string{"--consensus.min-peers", "10"},
+			args: []string{"--consensus.min-peers", "10", "--consensus.aggregate-sig=false"},
 			expConfig: &consensusConfig{
-				MinPeers: 10,
+				MinPeers:     10,
+				AggregateSig: false,
 			},
 		},
 		{
-			args: []string{"--delay_commit", "10ms", "--block_period", "5", "--min_peers", "10"},
+			args: []string{"--delay_commit", "10ms", "--block_period", "5", "--min_peers", "10",
+				"--consensus.aggregate-sig=true"},
 			expConfig: &consensusConfig{
-				MinPeers: 10,
+				MinPeers:     10,
+				AggregateSig: true,
 			},
 		},
 	}
diff --git a/cmd/harmony/main.go b/cmd/harmony/main.go
index 0c3e69c90..b07699d80 100644
--- a/cmd/harmony/main.go
+++ b/cmd/harmony/main.go
@@ -575,12 +575,16 @@ func setupConsensusAndNode(hc harmonyConfig, nodeConfig *nodeconfig.ConfigType)
 
 	// Parse minPeers from harmonyConfig
 	var minPeers int
+	var aggregateSig bool
 	if hc.Consensus != nil {
 		minPeers = hc.Consensus.MinPeers
+		aggregateSig = hc.Consensus.AggregateSig
 	} else {
 		minPeers = defaultConsensusConfig.MinPeers
+		aggregateSig = defaultConsensusConfig.AggregateSig
 	}
 	currentConsensus.MinPeers = minPeers
+	currentConsensus.AggregateSig = aggregateSig
 
 	blacklist, err := setupBlacklist(hc)
 	if err != nil {
diff --git a/consensus/consensus_service.go b/consensus/consensus_service.go
index 9f889b03d..4cac709c7 100644
--- a/consensus/consensus_service.go
+++ b/consensus/consensus_service.go
@@ -313,10 +313,8 @@ func (consensus *Consensus) UpdateConsensusInformation() Mode {
 
 	consensus.BlockPeriod = 5 * time.Second
 
-	// Enable aggregate sig at epoch 1000 for mainnet, at epoch 53000 for testnet, and always for other nets.
-	if (consensus.Blockchain.Config().ChainID == params.MainnetChainID && curEpoch.Cmp(big.NewInt(1000)) > 0) ||
-		(consensus.Blockchain.Config().ChainID == params.TestnetChainID && curEpoch.Cmp(big.NewInt(54500)) > 0) ||
-		(consensus.Blockchain.Config().ChainID != params.MainnetChainID && consensus.Blockchain.Config().ChainID != params.TestChainID) {
+	// Disable aggregate sig at epoch TBD for mainnet (for other net, it's default to true)
+	if consensus.Blockchain.Config().ChainID == params.MainnetChainID && curEpoch.Cmp(big.NewInt(1000)) >= 0 {
 		consensus.AggregateSig = true
 	}