diff --git a/consensus/beacon/consensus.go b/consensus/beacon/consensus.go
index 9e1c39b99a..ecabe15959 100644
--- a/consensus/beacon/consensus.go
+++ b/consensus/beacon/consensus.go
@@ -333,6 +333,11 @@ func (beacon *Beacon) verifyHeaders(chain consensus.ChainHeaderReader, headers [
 	return abort, results
 }
 
+// CurrentTurnTerm return the turnTerm at the latest block
+func (beacon *Beacon) CurrentTurnTerm(chain consensus.ChainHeaderReader) (turnTerm *uint64, err error) {
+	return nil, errors.New("not implemented")
+}
+
 // NextInTurnValidator return the next in-turn validator for header
 func (beacon *Beacon) NextInTurnValidator(chain consensus.ChainHeaderReader, header *types.Header) (common.Address, error) {
 	return common.Address{}, errors.New("not implemented")
diff --git a/consensus/clique/clique.go b/consensus/clique/clique.go
index ddacbc2e6e..cc83ef1786 100644
--- a/consensus/clique/clique.go
+++ b/consensus/clique/clique.go
@@ -511,6 +511,11 @@ func (c *Clique) verifySeal(snap *Snapshot, header *types.Header, parents []*typ
 	return nil
 }
 
+// CurrentTurnTerm return the turnTerm at the latest block
+func (c *Clique) CurrentTurnTerm(chain consensus.ChainHeaderReader) (turnTerm *uint64, err error) {
+	return nil, errors.New("not implemented")
+}
+
 // NextInTurnValidator return the next in-turn validator for header
 func (c *Clique) NextInTurnValidator(chain consensus.ChainHeaderReader, header *types.Header) (common.Address, error) {
 	return common.Address{}, errors.New("not implemented")
diff --git a/consensus/consensus.go b/consensus/consensus.go
index 7c65acb359..fb4cd63a23 100644
--- a/consensus/consensus.go
+++ b/consensus/consensus.go
@@ -97,6 +97,9 @@ type Engine interface {
 	// rules of a given engine.
 	VerifyUncles(chain ChainReader, block *types.Block) error
 
+	// CurrentTurnTerm return the turnTerm at the latest block
+	CurrentTurnTerm(chain ChainHeaderReader) (turnTerm *uint64, err error)
+
 	// NextInTurnValidator return the next in-turn validator for header
 	NextInTurnValidator(chain ChainHeaderReader, header *types.Header) (common.Address, error)
 
diff --git a/consensus/ethash/consensus.go b/consensus/ethash/consensus.go
index db730fab29..c9234e2ce7 100644
--- a/consensus/ethash/consensus.go
+++ b/consensus/ethash/consensus.go
@@ -489,6 +489,11 @@ var FrontierDifficultyCalculator = calcDifficultyFrontier
 var HomesteadDifficultyCalculator = calcDifficultyHomestead
 var DynamicDifficultyCalculator = makeDifficultyCalculator
 
+// CurrentTurnTerm return the turnTerm at the latest block
+func (ethash *Ethash) CurrentTurnTerm(chain consensus.ChainHeaderReader) (turnTerm *uint64, err error) {
+	return nil, errors.New("not implemented")
+}
+
 // NextInTurnValidator return the next in-turn validator for header
 func (ethash *Ethash) NextInTurnValidator(chain consensus.ChainHeaderReader, header *types.Header) (common.Address, error) {
 	return common.Address{}, errors.New("not implemented")
diff --git a/consensus/parlia/abi.go b/consensus/parlia/abi.go
index 0d9ab54cd5..59e9e71ae4 100644
--- a/consensus/parlia/abi.go
+++ b/consensus/parlia/abi.go
@@ -1015,6 +1015,19 @@ const validatorSetABIBeforeLuban = `
       "stateMutability": "view",
       "type": "function"
     },
+    {
+      "inputs": [],
+      "name": "getTurnTerm",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "inputs": [
         {
diff --git a/consensus/parlia/haberfork.go b/consensus/parlia/haberfork.go
new file mode 100644
index 0000000000..ca220a3f3d
--- /dev/null
+++ b/consensus/parlia/haberfork.go
@@ -0,0 +1,47 @@
+package parlia
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/core/systemcontracts"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/internal/ethapi"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/rpc"
+)
+
+func (p *Parlia) getTurnTerm(header *types.Header) (turnTerm *big.Int, err error) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	method := "getTurnTerm"
+	toAddress := common.HexToAddress(systemcontracts.ValidatorContract)
+	gas := (hexutil.Uint64)(uint64(math.MaxUint64 / 2))
+
+	data, err := p.validatorSetABI.Pack(method)
+	if err != nil {
+		log.Error("Unable to pack tx for getTurnTerm", "error", err)
+		return nil, err
+	}
+	msgData := (hexutil.Bytes)(data)
+
+	blockNr := rpc.BlockNumberOrHashWithHash(header.Hash(), false)
+	result, err := p.ethAPI.Call(ctx, ethapi.TransactionArgs{
+		Gas:  &gas,
+		To:   &toAddress,
+		Data: &msgData,
+	}, &blockNr, nil, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := p.validatorSetABI.UnpackIntoInterface(&turnTerm, method, result); err != nil {
+		return nil, err
+	}
+
+	return turnTerm, nil
+}
diff --git a/consensus/parlia/parlia.go b/consensus/parlia/parlia.go
index 69b82d408c..926fb82138 100644
--- a/consensus/parlia/parlia.go
+++ b/consensus/parlia/parlia.go
@@ -54,10 +54,12 @@ const (
 
 	checkpointInterval = 1024        // Number of blocks after which to save the snapshot to the database
 	defaultEpochLength = uint64(100) // Default number of blocks of checkpoint to update validatorSet from contract
+	defaultTurnTerm    = uint64(1)   // Default consecutive number of blocks a validator receives priority for block production
 
 	extraVanity      = 32 // Fixed number of extra-data prefix bytes reserved for signer vanity
 	extraSeal        = 65 // Fixed number of extra-data suffix bytes reserved for signer seal
 	nextForkHashSize = 4  // Fixed number of extra-data suffix bytes reserved for nextForkHash.
+	turnTermSize     = 1  // Fixed number of extra-data suffix bytes reserved for turnTerm
 
 	validatorBytesLengthBeforeLuban = common.AddressLength
 	validatorBytesLength            = common.AddressLength + types.BLSPublicKeyLength
@@ -136,6 +138,10 @@ var (
 	// list of validators different than the one the local node calculated.
 	errMismatchingEpochValidators = errors.New("mismatching validator list on epoch block")
 
+	// errMismatchingEpochTurnTerm is returned if a sprint block contains a
+	// turn term different than the one the local node calculated.
+	errMismatchingEpochTurnTerm = errors.New("mismatching turn term on epoch block")
+
 	// errInvalidDifficulty is returned if the difficulty of a block is missing.
 	errInvalidDifficulty = errors.New("invalid difficulty")
 
@@ -365,6 +371,7 @@ func (p *Parlia) VerifyHeaders(chain consensus.ChainHeaderReader, headers []*typ
 // On luban fork, we introduce vote attestation into the header's extra field, so extra format is different from before.
 // Before luban fork: |---Extra Vanity---|---Validators Bytes (or Empty)---|---Extra Seal---|
 // After luban fork:  |---Extra Vanity---|---Validators Number and Validators Bytes (or Empty)---|---Vote Attestation (or Empty)---|---Extra Seal---|
+// After haber fork:  |---Extra Vanity---|---Validators Number and Validators Bytes (or Empty)---|---Turn Term (or Empty)---|---Vote Attestation (or Empty)---|---Extra Seal---|
 func getValidatorBytesFromHeader(header *types.Header, chainConfig *params.ChainConfig, parliaConfig *params.ParliaConfig) []byte {
 	if len(header.Extra) <= extraVanity+extraSeal {
 		return nil
@@ -381,11 +388,11 @@ func getValidatorBytesFromHeader(header *types.Header, chainConfig *params.Chain
 		return nil
 	}
 	num := int(header.Extra[extraVanity])
-	if num == 0 || len(header.Extra) <= extraVanity+extraSeal+num*validatorBytesLength {
-		return nil
-	}
 	start := extraVanity + validatorNumberSize
 	end := start + num*validatorBytesLength
+	if num == 0 || len(header.Extra) < end+extraSeal {
+		return nil
+	}
 	return header.Extra[start:end]
 }
 
@@ -404,11 +411,14 @@ func getVoteAttestationFromHeader(header *types.Header, chainConfig *params.Chai
 		attestationBytes = header.Extra[extraVanity : len(header.Extra)-extraSeal]
 	} else {
 		num := int(header.Extra[extraVanity])
-		if len(header.Extra) <= extraVanity+extraSeal+validatorNumberSize+num*validatorBytesLength {
-			return nil, nil
-		}
 		start := extraVanity + validatorNumberSize + num*validatorBytesLength
+		if chainConfig.IsHaber(header.Number, header.Time) {
+			start += turnTermSize
+		}
 		end := len(header.Extra) - extraSeal
+		if end <= start {
+			return nil, nil
+		}
 		attestationBytes = header.Extra[start:end]
 	}
 
@@ -884,6 +894,33 @@ func (p *Parlia) prepareValidators(header *types.Header) error {
 	return nil
 }
 
+func (p *Parlia) prepareTurnTerm(chain consensus.ChainHeaderReader, header *types.Header) error {
+	if header.Number.Uint64()%p.config.Epoch != 0 ||
+		!p.chainConfig.IsHaber(header.Number, header.Time) {
+		return nil
+	}
+
+	parent := chain.GetHeaderByHash(header.ParentHash)
+	if parent == nil {
+		return errors.New("parent not found")
+	}
+
+	if p.chainConfig.IsHaber(parent.Number, parent.Time) {
+		turnTerm, err := p.getTurnTerm(parent)
+		if err != nil {
+			return err
+		}
+		if turnTerm == nil {
+			return errors.New("unexpected error when getTurnTerm")
+		}
+		header.Extra = append(header.Extra, byte(int(turnTerm.Int64())))
+	} else {
+		header.Extra = append(header.Extra, byte(int(defaultTurnTerm)))
+	}
+
+	return nil
+}
+
 func (p *Parlia) assembleVoteAttestation(chain consensus.ChainHeaderReader, header *types.Header) error {
 	if !p.chainConfig.IsLuban(header.Number) || header.Number.Uint64() < 2 {
 		return nil
@@ -967,6 +1004,16 @@ func (p *Parlia) assembleVoteAttestation(chain consensus.ChainHeaderReader, head
 	return nil
 }
 
+// CurrentTurnTerm return the turnTerm at the latest block
+func (p *Parlia) CurrentTurnTerm(chain consensus.ChainHeaderReader) (turnTerm *uint64, err error) {
+	currentHeader := chain.CurrentHeader()
+	snap, err := p.snapshot(chain, currentHeader.Number.Uint64(), currentHeader.Hash(), nil)
+	if err != nil {
+		return nil, err
+	}
+	return &snap.TurnTerm, nil
+}
+
 // NextInTurnValidator return the next in-turn validator for header
 func (p *Parlia) NextInTurnValidator(chain consensus.ChainHeaderReader, header *types.Header) (common.Address, error) {
 	snap, err := p.snapshot(chain, header.Number.Uint64(), header.Hash(), nil)
@@ -1015,6 +1062,9 @@ func (p *Parlia) Prepare(chain consensus.ChainHeaderReader, header *types.Header
 		return err
 	}
 
+	if err := p.prepareTurnTerm(chain, header); err != nil {
+		return err
+	}
 	// add extra seal space
 	header.Extra = append(header.Extra, make([]byte, extraSeal)...)
 
@@ -1065,6 +1115,40 @@ func (p *Parlia) verifyValidators(header *types.Header) error {
 	return nil
 }
 
+func (p *Parlia) verifyTurnTerm(chain consensus.ChainHeaderReader, header *types.Header) error {
+	if header.Number.Uint64()%p.config.Epoch != 0 ||
+		!p.chainConfig.IsHaber(header.Number, header.Time) {
+		return nil
+	}
+
+	turnTermFromHeader, err := parseTurnTerm(header, p.chainConfig, p.config)
+	if err != nil {
+		return err
+	}
+	if turnTermFromHeader != nil {
+		parent := chain.GetHeaderByHash(header.ParentHash)
+		if parent == nil {
+			return errors.New("parent not found")
+		}
+
+		if p.chainConfig.IsHaber(parent.Number, parent.Time) {
+			turnTermFromContract, err := p.getTurnTerm(parent)
+			if err != nil {
+				return err
+			}
+			if turnTermFromContract != nil && uint8(turnTermFromContract.Int64()) == *turnTermFromHeader {
+				return nil
+			}
+		} else {
+			if uint8(defaultTurnTerm) == *turnTermFromHeader {
+				return nil
+			}
+		}
+	}
+
+	return errMismatchingEpochTurnTerm
+}
+
 func (p *Parlia) distributeFinalityReward(chain consensus.ChainHeaderReader, state *state.StateDB, header *types.Header,
 	cx core.ChainContext, txs *[]*types.Transaction, receipts *[]*types.Receipt, systemTxs *[]*types.Transaction,
 	usedGas *uint64, mining bool) error {
@@ -1159,6 +1243,10 @@ func (p *Parlia) Finalize(chain consensus.ChainHeaderReader, header *types.Heade
 		return err
 	}
 
+	if err := p.verifyTurnTerm(chain, header); err != nil {
+		return err
+	}
+
 	cx := chainContext{Chain: chain, parlia: p}
 
 	parent := chain.GetHeaderByHash(header.ParentHash)
@@ -1185,7 +1273,7 @@ func (p *Parlia) Finalize(chain consensus.ChainHeaderReader, header *types.Heade
 		}
 	}
 	if header.Difficulty.Cmp(diffInTurn) != 0 {
-		spoiledVal := snap.supposeValidator()
+		spoiledVal := snap.inturnValidator()
 		signedRecently := false
 		if p.chainConfig.IsPlato(header.Number) {
 			signedRecently = snap.SignRecently(spoiledVal)
@@ -1276,7 +1364,7 @@ func (p *Parlia) FinalizeAndAssemble(chain consensus.ChainHeaderReader, header *
 		if err != nil {
 			return nil, nil, err
 		}
-		spoiledVal := snap.supposeValidator()
+		spoiledVal := snap.inturnValidator()
 		signedRecently := false
 		if p.chainConfig.IsPlato(header.Number) {
 			signedRecently = snap.SignRecently(spoiledVal)
@@ -1905,26 +1993,15 @@ func (p *Parlia) backOffTime(snap *Snapshot, header *types.Header, val common.Ad
 		delay := initialBackOffTime
 		validators := snap.validators()
 		if p.chainConfig.IsPlanck(header.Number) {
-			// reverse the key/value of snap.Recents to get recentsMap
-			recentsMap := make(map[common.Address]uint64, len(snap.Recents))
-			bound := uint64(0)
-			if n, limit := header.Number.Uint64(), uint64(len(validators)/2+1); n > limit {
-				bound = n - limit
-			}
-			for seen, recent := range snap.Recents {
-				if seen <= bound {
-					continue
-				}
-				recentsMap[recent] = seen
-			}
+			counts := snap.countRecents()
 
 			// The backOffTime does not matter when a validator has signed recently.
-			if _, ok := recentsMap[val]; ok {
+			if snap.signRecentlyByCounts(val, counts) {
 				return 0
 			}
 
-			inTurnAddr := validators[(snap.Number+1)%uint64(len(validators))]
-			if _, ok := recentsMap[inTurnAddr]; ok {
+			inTurnAddr := snap.inturnValidator()
+			if snap.signRecentlyByCounts(inTurnAddr, counts) {
 				log.Debug("in turn validator has recently signed, skip initialBackOffTime",
 					"inTurnAddr", inTurnAddr)
 				delay = 0
@@ -1933,7 +2010,7 @@ func (p *Parlia) backOffTime(snap *Snapshot, header *types.Header, val common.Ad
 			// Exclude the recently signed validators
 			temp := make([]common.Address, 0, len(validators))
 			for _, addr := range validators {
-				if _, ok := recentsMap[addr]; ok {
+				if snap.signRecentlyByCounts(addr, counts) {
 					continue
 				}
 				temp = append(temp, addr)
diff --git a/consensus/parlia/snapshot.go b/consensus/parlia/snapshot.go
index 0da0929e7c..51a401785d 100644
--- a/consensus/parlia/snapshot.go
+++ b/consensus/parlia/snapshot.go
@@ -43,6 +43,7 @@ type Snapshot struct {
 
 	Number           uint64                            `json:"number"`                // Block number where the snapshot was created
 	Hash             common.Hash                       `json:"hash"`                  // Block hash where the snapshot was created
+	TurnTerm         uint64                            `json:"turn_term"`             // The consecutive number of blocks a validator receives priority for block production
 	Validators       map[common.Address]*ValidatorInfo `json:"validators"`            // Set of authorized validators at this moment
 	Recents          map[uint64]common.Address         `json:"recents"`               // Set of recent validators for spam protections
 	RecentForkHashes map[uint64]string                 `json:"recent_fork_hashes"`    // Set of recent forkHash
@@ -72,6 +73,7 @@ func newSnapshot(
 		sigCache:         sigCache,
 		Number:           number,
 		Hash:             hash,
+		TurnTerm:         defaultTurnTerm,
 		Recents:          make(map[uint64]common.Address),
 		RecentForkHashes: make(map[uint64]string),
 		Validators:       make(map[common.Address]*ValidatorInfo),
@@ -114,6 +116,10 @@ func loadSnapshot(config *params.ParliaConfig, sigCache *lru.ARCCache, db ethdb.
 	if err := json.Unmarshal(blob, snap); err != nil {
 		return nil, err
 	}
+	if snap.TurnTerm == 0 { // no TurnTerm field in old snapshots
+		snap.TurnTerm = defaultTurnTerm
+	}
+
 	snap.config = config
 	snap.sigCache = sigCache
 	snap.ethAPI = ethAPI
@@ -138,6 +144,7 @@ func (s *Snapshot) copy() *Snapshot {
 		sigCache:         s.sigCache,
 		Number:           s.Number,
 		Hash:             s.Hash,
+		TurnTerm:         s.TurnTerm,
 		Validators:       make(map[common.Address]*ValidatorInfo),
 		Recents:          make(map[uint64]common.Address),
 		RecentForkHashes: make(map[uint64]string),
@@ -210,17 +217,40 @@ func (s *Snapshot) updateAttestation(header *types.Header, chainConfig *params.C
 	}
 }
 
-func (s *Snapshot) SignRecently(validator common.Address) bool {
+func (s *Snapshot) minerHistoryCheck() uint64 {
+	return uint64(len(s.Validators)) / 2 * s.TurnTerm
+}
+
+func (s *Snapshot) countRecents() map[common.Address]uint64 {
+	leftHistoryBound := uint64(0) // the bound is excluded
+	checkHistoryLength := s.minerHistoryCheck()
+	if s.Number >= checkHistoryLength {
+		leftHistoryBound = s.Number - checkHistoryLength
+	}
+	counts := make(map[common.Address]uint64, len(s.Validators))
 	for seen, recent := range s.Recents {
-		if recent == validator {
-			if limit := uint64(len(s.Validators)/2 + 1); s.Number+1 < limit || seen > s.Number+1-limit {
-				return true
-			}
+		if seen > leftHistoryBound {
+			counts[recent] += 1
+		}
+	}
+	return counts
+}
+
+func (s *Snapshot) signRecentlyByCounts(validator common.Address, counts map[common.Address]uint64) bool {
+	if seenTimes, ok := counts[validator]; ok && seenTimes >= s.TurnTerm {
+		if seenTimes > s.TurnTerm {
+			log.Warn("produce more blocks than expected!", "validator", validator, "seenTimes", seenTimes)
 		}
+		return true
 	}
+
 	return false
 }
 
+func (s *Snapshot) SignRecently(validator common.Address) bool {
+	return s.signRecentlyByCounts(validator, s.countRecents())
+}
+
 func (s *Snapshot) apply(headers []*types.Header, chain consensus.ChainHeaderReader, parents []*types.Header, chainConfig *params.ChainConfig) (*Snapshot, error) {
 	// Allow passing in no headers for cleaner code
 	if len(headers) == 0 {
@@ -247,10 +277,8 @@ func (s *Snapshot) apply(headers []*types.Header, chain consensus.ChainHeaderRea
 	for _, header := range headers {
 		number := header.Number.Uint64()
 		// Delete the oldest validator from the recent list to allow it signing again
-		if limit := uint64(len(snap.Validators)/2 + 1); number >= limit {
+		if limit := s.minerHistoryCheck() + 1; number >= limit { // `+1` for genesis block which has no miner
 			delete(snap.Recents, number-limit)
-		}
-		if limit := uint64(len(snap.Validators)); number >= limit {
 			delete(snap.RecentForkHashes, number-limit)
 		}
 		// Resolve the authorization key and check against signers
@@ -261,19 +289,34 @@ func (s *Snapshot) apply(headers []*types.Header, chain consensus.ChainHeaderRea
 		if _, ok := snap.Validators[validator]; !ok {
 			return nil, errUnauthorizedValidator(validator.String())
 		}
-		for _, recent := range snap.Recents {
-			if recent == validator {
+		if chainConfig.IsHaber(header.Number, header.Time) {
+			if snap.SignRecently(validator) {
 				return nil, errRecentlySigned
 			}
+		} else {
+			for _, recent := range snap.Recents {
+				if recent == validator {
+					return nil, errRecentlySigned
+				}
+			}
 		}
-		snap.Recents[number] = validator
 		// change validator set
-		if number > 0 && number%s.config.Epoch == uint64(len(snap.Validators)/2) {
-			checkpointHeader := FindAncientHeader(header, uint64(len(snap.Validators)/2), chain, parents)
+		if number > 0 && number%s.config.Epoch == s.minerHistoryCheck() {
+			checkpointHeader := FindAncientHeader(header, s.minerHistoryCheck(), chain, parents)
 			if checkpointHeader == nil {
 				return nil, consensus.ErrUnknownAncestor
 			}
 
+			oldLimit := s.minerHistoryCheck() + 1
+			// get turnTerm from headers and use that for new turnTerm
+			turnTerm, err := parseTurnTerm(checkpointHeader, chainConfig, s.config)
+			if err != nil {
+				return nil, err
+			}
+			if turnTerm != nil {
+				s.TurnTerm = uint64(*turnTerm)
+			}
+
 			// get validators from headers and use that for new validator set
 			newValArr, voteAddrs, err := parseValidators(checkpointHeader, chainConfig, s.config)
 			if err != nil {
@@ -289,20 +332,6 @@ func (s *Snapshot) apply(headers []*types.Header, chain consensus.ChainHeaderRea
 					}
 				}
 			}
-			oldLimit := len(snap.Validators)/2 + 1
-			newLimit := len(newVals)/2 + 1
-			if newLimit < oldLimit {
-				for i := 0; i < oldLimit-newLimit; i++ {
-					delete(snap.Recents, number-uint64(newLimit)-uint64(i))
-				}
-			}
-			oldLimit = len(snap.Validators)
-			newLimit = len(newVals)
-			if newLimit < oldLimit {
-				for i := 0; i < oldLimit-newLimit; i++ {
-					delete(snap.RecentForkHashes, number-uint64(newLimit)-uint64(i))
-				}
-			}
 			snap.Validators = newVals
 			if chainConfig.IsLuban(header.Number) {
 				validators := snap.validators()
@@ -310,10 +339,21 @@ func (s *Snapshot) apply(headers []*types.Header, chain consensus.ChainHeaderRea
 					snap.Validators[val].Index = idx + 1 // offset by 1
 				}
 			}
+
+			newLimit := s.minerHistoryCheck() + 1
+			for i := newLimit; i < oldLimit; i++ {
+				delete(snap.Recents, number-i)
+				delete(snap.RecentForkHashes, number-i)
+			}
+
+			if chainConfig.IsHaber(header.Number, header.Time) {
+				// without this logic, there will be several off-turn blocks when do validator set switch
+				snap.Recents = make(map[uint64]common.Address)
+			}
 		}
 
 		snap.updateAttestation(header, chainConfig, s.config)
-
+		snap.Recents[number] = validator
 		snap.RecentForkHashes[number] = hex.EncodeToString(header.Extra[extraVanity-nextForkHashSize : extraVanity])
 	}
 	snap.Number += uint64(len(headers))
@@ -333,15 +373,13 @@ func (s *Snapshot) validators() []common.Address {
 
 // inturn returns if a validator at a given block height is in-turn or not.
 func (s *Snapshot) inturn(validator common.Address) bool {
-	validators := s.validators()
-	offset := (s.Number + 1) % uint64(len(validators))
-	return validators[offset] == validator
+	return s.inturnValidator() == validator
 }
 
 // inturnValidator returns the validator at a given block height.
 func (s *Snapshot) inturnValidator() common.Address {
 	validators := s.validators()
-	offset := (s.Number + 1) % uint64(len(validators))
+	offset := (s.Number + 1) / s.TurnTerm % uint64(len(validators))
 	return validators[offset]
 }
 
@@ -379,12 +417,6 @@ func (s *Snapshot) indexOfVal(validator common.Address) int {
 	return -1
 }
 
-func (s *Snapshot) supposeValidator() common.Address {
-	validators := s.validators()
-	index := (s.Number + 1) % uint64(len(validators))
-	return validators[index]
-}
-
 func parseValidators(header *types.Header, chainConfig *params.ChainConfig, parliaConfig *params.ParliaConfig) ([]common.Address, []types.BLSPublicKey, error) {
 	validatorsBytes := getValidatorBytesFromHeader(header, chainConfig, parliaConfig)
 	if len(validatorsBytes) == 0 {
@@ -410,6 +442,24 @@ func parseValidators(header *types.Header, chainConfig *params.ChainConfig, parl
 	return cnsAddrs, voteAddrs, nil
 }
 
+func parseTurnTerm(header *types.Header, chainConfig *params.ChainConfig, parliaConfig *params.ParliaConfig) (*uint8, error) {
+	if header.Number.Uint64()%parliaConfig.Epoch != 0 ||
+		!chainConfig.IsHaber(header.Number, header.Time) {
+		return nil, nil
+	}
+
+	if len(header.Extra) <= extraVanity+extraSeal {
+		return nil, errors.New("invalid turnTerm")
+	}
+	num := int(header.Extra[extraVanity])
+	pos := extraVanity + validatorNumberSize + num*validatorBytesLength
+	if len(header.Extra) <= pos {
+		return nil, errors.New("invalid turnTerm")
+	}
+	turnterm := header.Extra[pos]
+	return &turnterm, nil
+}
+
 func FindAncientHeader(header *types.Header, ite uint64, chain consensus.ChainHeaderReader, candidateParents []*types.Header) *types.Header {
 	ancient := header
 	for i := uint64(1); i <= ite; i++ {
diff --git a/core/systemcontracts/haber/chapel/ValidatorContract b/core/systemcontracts/haber/chapel/ValidatorContract
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/core/systemcontracts/haber/mainnet/ValidatorContract b/core/systemcontracts/haber/mainnet/ValidatorContract
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/core/systemcontracts/haber/rialto/ValidatorContract b/core/systemcontracts/haber/rialto/ValidatorContract
new file mode 100644
index 0000000000..37b4bca0c1
--- /dev/null
+++ b/core/systemcontracts/haber/rialto/ValidatorContract
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/core/systemcontracts/haber/types.go b/core/systemcontracts/haber/types.go
new file mode 100644
index 0000000000..9f2a9a77a9
--- /dev/null
+++ b/core/systemcontracts/haber/types.go
@@ -0,0 +1,21 @@
+package haber
+
+import _ "embed"
+
+// contract codes for Mainnet upgrade
+var (
+	//go:embed mainnet/ValidatorContract
+	MainnetValidatorContract string
+)
+
+// contract codes for Chapel upgrade
+var (
+	//go:embed chapel/ValidatorContract
+	ChapelValidatorContract string
+)
+
+// contract codes for Rialto upgrade
+var (
+	//go:embed rialto/ValidatorContract
+	RialtoValidatorContract string
+)
diff --git a/core/systemcontracts/upgrade.go b/core/systemcontracts/upgrade.go
index 393b529113..e5f2ae7ee5 100644
--- a/core/systemcontracts/upgrade.go
+++ b/core/systemcontracts/upgrade.go
@@ -15,6 +15,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/systemcontracts/feynman"
 	feynmanFix "github.com/ethereum/go-ethereum/core/systemcontracts/feynman_fix"
 	"github.com/ethereum/go-ethereum/core/systemcontracts/gibbs"
+	"github.com/ethereum/go-ethereum/core/systemcontracts/haber"
 	"github.com/ethereum/go-ethereum/core/systemcontracts/kepler"
 	"github.com/ethereum/go-ethereum/core/systemcontracts/luban"
 	"github.com/ethereum/go-ethereum/core/systemcontracts/mirror"
@@ -75,6 +76,8 @@ var (
 	feynmanUpgrade = make(map[string]*Upgrade)
 
 	feynmanFixUpgrade = make(map[string]*Upgrade)
+
+	haberUpgrade = make(map[string]*Upgrade)
 )
 
 func init() {
@@ -701,6 +704,17 @@ func init() {
 			},
 		},
 	}
+
+	haberUpgrade[rialtoNet] = &Upgrade{
+		UpgradeName: "haber",
+		Configs: []*UpgradeConfig{
+			{
+				ContractAddr: common.HexToAddress(ValidatorContract),
+				CommitUrl:    "https://github.com/NathanBSC/bsc-genesis-contract/commit/0844e7e8acc01eae7a5a27a7fc1f886d313ff455",
+				Code:         haber.RialtoValidatorContract,
+			},
+		},
+	}
 }
 
 func UpgradeBuildInSystemContract(config *params.ChainConfig, blockNumber *big.Int, lastBlockTime uint64, blockTime uint64, statedb *state.StateDB) {
@@ -777,6 +791,10 @@ func UpgradeBuildInSystemContract(config *params.ChainConfig, blockNumber *big.I
 		applySystemContractUpgrade(feynmanFixUpgrade[network], blockNumber, statedb, logger)
 	}
 
+	if config.IsOnHaber(blockNumber, lastBlockTime, blockTime) {
+		applySystemContractUpgrade(haberUpgrade[network], blockNumber, statedb, logger)
+	}
+
 	/*
 		apply other upgrades
 	*/
diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index e31cee15ec..188f99fb3a 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -870,7 +870,10 @@ func (s *BlockChainAPI) GetFinalizedHeader(ctx context.Context, probabilisticFin
 		return nil, fmt.Errorf("%d out of range [2,21]", probabilisticFinalized)
 	}
 
-	var err error
+	currentTurnTerm, err := s.b.Engine().CurrentTurnTerm(s.b.Chain())
+	if err != nil { // impossible
+		return nil, err
+	}
 	fastFinalizedHeader, err := s.b.HeaderByNumber(ctx, rpc.FinalizedBlockNumber)
 	if err != nil { // impossible
 		return nil, err
@@ -879,7 +882,7 @@ func (s *BlockChainAPI) GetFinalizedHeader(ctx context.Context, probabilisticFin
 	if err != nil { // impossible
 		return nil, err
 	}
-	finalizedBlockNumber := max(fastFinalizedHeader.Number.Int64(), latestHeader.Number.Int64()-probabilisticFinalized)
+	finalizedBlockNumber := max(fastFinalizedHeader.Number.Int64(), latestHeader.Number.Int64()-probabilisticFinalized*int64((*currentTurnTerm)))
 
 	return s.GetHeaderByNumber(ctx, rpc.BlockNumber(finalizedBlockNumber))
 }
@@ -894,7 +897,10 @@ func (s *BlockChainAPI) GetFinalizedBlock(ctx context.Context, probabilisticFina
 		return nil, fmt.Errorf("%d out of range [2,21]", probabilisticFinalized)
 	}
 
-	var err error
+	currentTurnTerm, err := s.b.Engine().CurrentTurnTerm(s.b.Chain())
+	if err != nil { // impossible
+		return nil, err
+	}
 	fastFinalizedHeader, err := s.b.HeaderByNumber(ctx, rpc.FinalizedBlockNumber)
 	if err != nil { // impossible
 		return nil, err
@@ -903,7 +909,7 @@ func (s *BlockChainAPI) GetFinalizedBlock(ctx context.Context, probabilisticFina
 	if err != nil { // impossible
 		return nil, err
 	}
-	finalizedBlockNumber := max(fastFinalizedHeader.Number.Int64(), latestHeader.Number.Int64()-probabilisticFinalized)
+	finalizedBlockNumber := max(fastFinalizedHeader.Number.Int64(), latestHeader.Number.Int64()-probabilisticFinalized*int64((*currentTurnTerm)))
 
 	return s.GetBlockByNumber(ctx, rpc.BlockNumber(finalizedBlockNumber), fullTx)
 }
diff --git a/params/config.go b/params/config.go
index 610afc470f..a27694d99d 100644
--- a/params/config.go
+++ b/params/config.go
@@ -929,6 +929,15 @@ func (c *ChainConfig) IsHaber(num *big.Int, time uint64) bool {
 	return c.IsLondon(num) && isTimestampForked(c.HaberTime, time)
 }
 
+// IsOnHaber returns whether currentBlockTime is either equal to the Haber fork time or greater firstly.
+func (c *ChainConfig) IsOnHaber(currentBlockNumber *big.Int, lastBlockTime uint64, currentBlockTime uint64) bool {
+	lastBlockNumber := new(big.Int)
+	if currentBlockNumber.Cmp(big.NewInt(1)) >= 0 {
+		lastBlockNumber.Sub(currentBlockNumber, big.NewInt(1))
+	}
+	return !c.IsHaber(lastBlockNumber, lastBlockTime) && c.IsHaber(currentBlockNumber, currentBlockTime)
+}
+
 // IsPrague returns whether num is either equal to the Prague fork time or greater.
 func (c *ChainConfig) IsPrague(num *big.Int, time uint64) bool {
 	return c.IsLondon(num) && isTimestampForked(c.PragueTime, time)