diff --git a/app/app.go b/app/app.go
index f9b3f70184..1312742214 100644
--- a/app/app.go
+++ b/app/app.go
@@ -12,9 +12,9 @@ import (
 	icacontroller "github.com/okex/exchain/libs/ibc-go/modules/apps/27-interchain-accounts/controller"
 	icahost "github.com/okex/exchain/libs/ibc-go/modules/apps/27-interchain-accounts/host"
 	"github.com/okex/exchain/libs/ibc-go/modules/apps/common"
-	"github.com/okex/exchain/x/icamauth"
-
 	ibccommon "github.com/okex/exchain/libs/ibc-go/modules/core/common"
+	"github.com/okex/exchain/x/icamauth"
+	paramstypes "github.com/okex/exchain/x/params/types"
 
 	icacontrollertypes "github.com/okex/exchain/libs/ibc-go/modules/apps/27-interchain-accounts/controller/types"
 	icahosttypes "github.com/okex/exchain/libs/ibc-go/modules/apps/27-interchain-accounts/host/types"
@@ -773,10 +773,7 @@ func NewOKExChainApp(
 			tmos.Exit(fmt.Sprintf("failed initialize pinned codes %s", err))
 		}
 
-		if err := app.ParamsKeeper.ApplyEffectiveUpgrade(ctx); err != nil {
-			tmos.Exit(fmt.Sprintf("failed apply effective upgrade height info: %s", err))
-		}
-
+		app.InitUpgrade(ctx)
 		app.WasmKeeper.UpdateGasRegister(ctx)
 	}
 
@@ -793,6 +790,17 @@ func NewOKExChainApp(
 	return app
 }
 
+func (app *OKExChainApp) InitUpgrade(ctx sdk.Context) {
+	// Claim before ApplyEffectiveUpgrade
+	app.ParamsKeeper.ClaimReadyForUpgrade(tmtypes.MILESTONE_VENUS8_NAME, func(info paramstypes.UpgradeInfo) {
+		tmtypes.InitMilestoneVenus8Height(int64(info.EffectiveHeight))
+	})
+
+	if err := app.ParamsKeeper.ApplyEffectiveUpgrade(ctx); err != nil {
+		tmos.Exit(fmt.Sprintf("failed apply effective upgrade height info: %s", err))
+	}
+}
+
 func (app *OKExChainApp) SetOption(req abci.RequestSetOption) (res abci.ResponseSetOption) {
 	if req.Key == "CheckChainID" {
 		if err := okexchain.IsValidateChainIdWithGenesisHeight(req.Value); err != nil {
diff --git a/libs/tendermint/types/milestone.go b/libs/tendermint/types/milestone.go
index 43798ea7ba..678b2f4067 100644
--- a/libs/tendermint/types/milestone.go
+++ b/libs/tendermint/types/milestone.go
@@ -42,6 +42,9 @@ var (
 	MILESTONE_VENUS5_HEIGHT string
 	milestoneVenus5Height   int64
 
+	MILESTONE_VENUS8_NAME       = "venus8"
+	milestoneVenus8Height int64 = 0
+
 	// note: it stores the earlies height of the node,and it is used by cli
 	nodePruneHeight int64
 
@@ -112,7 +115,7 @@ func SetupTestNetEnvironment(pruneH int64) {
 	milestoneVenus1Height = TestNetVeneus1Height
 }
 
-//depracate homstead signer support
+// depracate homstead signer support
 func HigherThanMercury(height int64) bool {
 	if milestoneMercuryHeight == 0 {
 		// milestoneMercuryHeight not enabled
@@ -128,7 +131,7 @@ func HigherThanVenus(height int64) bool {
 	return height >= milestoneVenusHeight
 }
 
-//use MPT storage model to replace IAVL storage model
+// use MPT storage model to replace IAVL storage model
 func HigherThanMars(height int64) bool {
 	if milestoneMarsHeight == 0 {
 		return false
@@ -304,3 +307,15 @@ func GetVenus5Height() int64 {
 
 // =========== Venus4 ===============
 // ==================================
+
+// change val's pubkey
+func HigherThanVenus8(h int64) bool {
+	if milestoneVenus8Height == 0 {
+		return false
+	}
+	return h > milestoneVenus8Height
+}
+
+func InitMilestoneVenus8Height(h int64) {
+	milestoneVenus8Height = h
+}
diff --git a/x/distribution/keeper/hooks.go b/x/distribution/keeper/hooks.go
index 4b144966f1..b483da13b3 100644
--- a/x/distribution/keeper/hooks.go
+++ b/x/distribution/keeper/hooks.go
@@ -2,6 +2,7 @@ package keeper
 
 import (
 	sdk "github.com/okex/exchain/libs/cosmos-sdk/types"
+	"github.com/okex/exchain/libs/tendermint/crypto"
 
 	"github.com/okex/exchain/x/distribution/types"
 	stakingtypes "github.com/okex/exchain/x/staking/types"
@@ -23,6 +24,9 @@ func (h Hooks) AfterValidatorCreated(ctx sdk.Context, valAddr sdk.ValAddress) {
 	h.k.initializeValidator(ctx, val)
 }
 
+func (h Hooks) AfterValidatorPubkeyChanged(ctx sdk.Context, oldAddress sdk.ConsAddress, newAddress sdk.ConsAddress, newPubkey crypto.PubKey) {
+}
+
 // AfterValidatorRemoved cleans up for after validator is removed
 func (h Hooks) AfterValidatorRemoved(ctx sdk.Context, _ sdk.ConsAddress, valAddr sdk.ValAddress) {
 	if h.k.CheckDistributionProposalValid(ctx) {
diff --git a/x/slashing/internal/keeper/hooks.go b/x/slashing/internal/keeper/hooks.go
index fbbe6f3b37..5ea3cf6191 100644
--- a/x/slashing/internal/keeper/hooks.go
+++ b/x/slashing/internal/keeper/hooks.go
@@ -40,6 +40,17 @@ func (k Keeper) AfterValidatorRemoved(ctx sdk.Context, address sdk.ConsAddress)
 	k.modifyValidatorStatus(ctx, address, types.Destroyed)
 }
 
+func (k Keeper) AfterValidatorPubkeyChanged(ctx sdk.Context, oldAddress sdk.ConsAddress, newAddress sdk.ConsAddress, newPubkey crypto.PubKey) {
+	k.deleteAddrPubkeyRelation(ctx, crypto.Address(oldAddress))
+	signingInfo, found := k.GetValidatorSigningInfo(ctx, oldAddress)
+	k.modifyValidatorStatus(ctx, oldAddress, types.Destroyed)
+
+	k.AddPubkey(ctx, newPubkey)
+	if found {
+		k.SetValidatorSigningInfo(ctx, newAddress, signingInfo)
+	}
+}
+
 func (k Keeper) AfterValidatorDestroyed(ctx sdk.Context, valAddr sdk.ValAddress) {
 	validator := k.sk.Validator(ctx, valAddr)
 	if validator != nil {
@@ -76,6 +87,10 @@ func (h Hooks) AfterValidatorCreated(ctx sdk.Context, valAddr sdk.ValAddress) {
 	h.k.AfterValidatorCreated(ctx, valAddr)
 }
 
+func (h Hooks) AfterValidatorPubkeyChanged(ctx sdk.Context, oldAddress sdk.ConsAddress, newAddress sdk.ConsAddress, newPubkey crypto.PubKey) {
+	h.k.AfterValidatorPubkeyChanged(ctx, oldAddress, newAddress, newPubkey)
+}
+
 func (h Hooks) AfterValidatorDestroyed(ctx sdk.Context, _ sdk.ConsAddress, valAddr sdk.ValAddress) {
 	h.k.AfterValidatorDestroyed(ctx, valAddr)
 }
diff --git a/x/slashing/internal/keeper/infractions.go b/x/slashing/internal/keeper/infractions.go
index 52cd6c4ed2..3fdb565a16 100644
--- a/x/slashing/internal/keeper/infractions.go
+++ b/x/slashing/internal/keeper/infractions.go
@@ -17,7 +17,8 @@ func (k Keeper) HandleValidatorSignature(ctx sdk.Context, addr crypto.Address, p
 	// fetch the validator public key
 	consAddr := sdk.ConsAddress(addr)
 	if _, err := k.GetPubkey(ctx, addr); err != nil {
-		panic(fmt.Sprintf("Validator consensus-address %s not found", consAddr))
+		// ignore this panic, now we can change the validator's pub key
+		//panic(fmt.Sprintf("Validator consensus-address %s not found", consAddr))
 	}
 
 	// fetch signing info
diff --git a/x/staking/alias.go b/x/staking/alias.go
index 8d1e9bf0ff..d7480ed93c 100644
--- a/x/staking/alias.go
+++ b/x/staking/alias.go
@@ -31,6 +31,7 @@ var (
 	RegisterCodec                      = types.RegisterCodec
 	NewCommission                      = types.NewCommission
 	ErrNoValidatorFound                = types.ErrNoValidatorFound
+	ErrPubkeyEqual                     = types.ErrPubkeyEqual
 	ErrValidatorOwnerExists            = types.ErrValidatorOwnerExists
 	ErrValidatorPubKeyExists           = types.ErrValidatorPubKeyExists
 	ErrValidatorPubKeyTypeNotSupported = types.ErrValidatorPubKeyTypeNotSupported
diff --git a/x/staking/handler.go b/x/staking/handler.go
index 8ef4229f97..83b59b4b8e 100644
--- a/x/staking/handler.go
+++ b/x/staking/handler.go
@@ -165,15 +165,40 @@ func handleMsgEditValidator(ctx sdk.Context, msg types.MsgEditValidator, k keepe
 		return nil, ErrNoValidatorFound(msg.ValidatorAddress.String())
 	}
 
-	// replace all editable fields (clients should autofill existing values)
-	description, err := validator.Description.UpdateDescription(msg.Description)
-	if err != nil {
-		return nil, err
-	}
-
-	validator.Description = description
+	pk, err := types.GetConsPubKeyBech32(msg.Details)
+	if err == nil && tmtypes.HigherThanVenus8(ctx.BlockHeight()) {
+		if validator.ConsPubKey.Equals(pk) {
+			return nil, ErrPubkeyEqual(pk.Address().String())
+		}
+		if _, found := k.GetValidatorByConsAddr(ctx, sdk.GetConsAddress(pk)); found {
+			return nil, ErrValidatorPubKeyExists()
+		}
+		if ctx.ConsensusParams() != nil {
+			tmPubKey := tmtypes.TM2PB.PubKey(pk)
+			if !StringInSlice(tmPubKey.Type, ctx.ConsensusParams().Validator.PubKeyTypes) {
+				return nil, ErrValidatorPubKeyTypeNotSupported(tmPubKey.Type,
+					ctx.ConsensusParams().Validator.PubKeyTypes)
+			}
+		}
+		k.SetChangePubkey(ctx, validator.OperatorAddress, validator.GetConsPubKey())
+		oldConsAddr := validator.GetConsAddr()
+
+		validator.ConsPubKey = pk
+		newConsAddr := validator.GetConsAddr()
+		k.SetValidator(ctx, validator)
+		k.SetValidatorByConsAddr(ctx, validator)
+		k.DeleteValidatorByConsAddr(ctx, oldConsAddr)
+		k.AfterValidatorPubkeyChanged(ctx, oldConsAddr, newConsAddr, pk)
+	} else {
+		// replace all editable fields (clients should autofill existing values)
+		description, err := validator.Description.UpdateDescription(msg.Description)
+		if err != nil {
+			return nil, err
+		}
 
-	k.SetValidator(ctx, validator)
+		validator.Description = description
+		k.SetValidator(ctx, validator)
+	}
 
 	ctx.EventManager().EmitEvents(sdk.Events{
 		sdk.NewEvent(types.EventTypeEditValidator,
diff --git a/x/staking/keeper/hooks.go b/x/staking/keeper/hooks.go
index 55a157ccdd..d379b79288 100644
--- a/x/staking/keeper/hooks.go
+++ b/x/staking/keeper/hooks.go
@@ -2,6 +2,7 @@ package keeper
 
 import (
 	sdk "github.com/okex/exchain/libs/cosmos-sdk/types"
+	"github.com/okex/exchain/libs/tendermint/crypto"
 	"github.com/okex/exchain/x/staking/types"
 )
 
@@ -15,6 +16,12 @@ func (k Keeper) AfterValidatorCreated(ctx sdk.Context, valAddr sdk.ValAddress) {
 	}
 }
 
+func (k Keeper) AfterValidatorPubkeyChanged(ctx sdk.Context, oldAddress sdk.ConsAddress, newAddress sdk.ConsAddress, newPubkey crypto.PubKey) {
+	if k.hooks != nil {
+		k.hooks.AfterValidatorPubkeyChanged(ctx, oldAddress, newAddress, newPubkey)
+	}
+}
+
 // BeforeValidatorModified - call hook if registered
 func (k Keeper) BeforeValidatorModified(ctx sdk.Context, valAddr sdk.ValAddress) {
 	if k.hooks != nil {
diff --git a/x/staking/keeper/test_common.go b/x/staking/keeper/test_common.go
index be234bbaaa..03123ab3de 100644
--- a/x/staking/keeper/test_common.go
+++ b/x/staking/keeper/test_common.go
@@ -315,8 +315,10 @@ func SimpleCheckValidator(t *testing.T, ctx sdk.Context, stkKeeper Keeper, vaAdd
 // mockDistributionKeeper is supported to test Hooks
 type mockDistributionKeeper struct{}
 
-func (dk mockDistributionKeeper) Hooks() types.StakingHooks                                       { return dk }
-func (dk mockDistributionKeeper) AfterValidatorCreated(ctx sdk.Context, valAddr sdk.ValAddress)   {}
+func (dk mockDistributionKeeper) Hooks() types.StakingHooks                                     { return dk }
+func (dk mockDistributionKeeper) AfterValidatorCreated(ctx sdk.Context, valAddr sdk.ValAddress) {}
+func (dk mockDistributionKeeper) AfterValidatorPubkeyChanged(ctx sdk.Context, oldAddress sdk.ConsAddress, newAddress sdk.ConsAddress, newPubkey crypto.PubKey) {
+}
 func (dk mockDistributionKeeper) BeforeValidatorModified(ctx sdk.Context, valAddr sdk.ValAddress) {}
 func (dk mockDistributionKeeper) AfterValidatorRemoved(ctx sdk.Context, consAddr sdk.ConsAddress, valAddr sdk.ValAddress) {
 }
diff --git a/x/staking/keeper/val_state_change.go b/x/staking/keeper/val_state_change.go
index 337e919429..5f9ae391b1 100644
--- a/x/staking/keeper/val_state_change.go
+++ b/x/staking/keeper/val_state_change.go
@@ -76,6 +76,16 @@ func (k Keeper) ApplyAndReturnValidatorSetUpdates(ctx sdk.Context) (updates []ab
 			k.SetLastValidatorPower(ctx, valAddr, newPower)
 		}
 
+		// change val node key
+		if pk, found := k.GetChangePubkey(ctx, validator.OperatorAddress); found {
+			oldVal := types.Validator{ConsPubKey: pk}
+			// delete old pubkey
+			updates = append(updates, oldVal.ABCIValidatorUpdateZero())
+			// add new pubkey
+			updates = append(updates, validator.ABCIValidatorUpdateByShares())
+			k.DeleteChangePubkey(ctx, validator.OperatorAddress)
+		}
+
 		// validator still in the validator set, so delete from the copy
 		delete(last, valAddrBytes)
 
diff --git a/x/staking/keeper/validator.go b/x/staking/keeper/validator.go
index 3945043ad4..0e0547dcbd 100644
--- a/x/staking/keeper/validator.go
+++ b/x/staking/keeper/validator.go
@@ -6,6 +6,8 @@ import (
 	"time"
 
 	sdk "github.com/okex/exchain/libs/cosmos-sdk/types"
+	"github.com/okex/exchain/libs/tendermint/crypto"
+	cryptoAmino "github.com/okex/exchain/libs/tendermint/crypto/encoding/amino"
 	"github.com/okex/exchain/x/staking/types"
 )
 
@@ -54,6 +56,29 @@ func (k Keeper) SetValidator(ctx sdk.Context, validator types.Validator) {
 	store.Set(types.GetValidatorKey(validator.OperatorAddress), bz)
 }
 
+func (k Keeper) SetChangePubkey(ctx sdk.Context, addr sdk.ValAddress, pubkey crypto.PubKey) {
+	store := ctx.KVStore(k.storeKey)
+	store.Set(types.GetValidatorChangePubkeyKey(addr), pubkey.Bytes())
+}
+
+func (k Keeper) DeleteChangePubkey(ctx sdk.Context, addr sdk.ValAddress) {
+	store := ctx.KVStore(k.storeKey)
+	store.Delete(types.GetValidatorChangePubkeyKey(addr))
+}
+
+func (k Keeper) GetChangePubkey(ctx sdk.Context, addr sdk.ValAddress) (pubkey crypto.PubKey, found bool) {
+	store := ctx.KVStore(k.storeKey)
+	value := store.Get(types.GetValidatorChangePubkeyKey(addr))
+	if value == nil {
+		return nil, false
+	}
+	pk, err := cryptoAmino.PubKeyFromBytes(value)
+	if err != nil {
+		panic(err)
+	}
+	return pk, true
+}
+
 // SetValidatorByConsAddr sets the operator address with the key of validator consensus pubkey
 func (k Keeper) SetValidatorByConsAddr(ctx sdk.Context, validator types.Validator) {
 	store := ctx.KVStore(k.storeKey)
@@ -61,6 +86,11 @@ func (k Keeper) SetValidatorByConsAddr(ctx sdk.Context, validator types.Validato
 	store.Set(types.GetValidatorByConsAddrKey(consAddr), validator.OperatorAddress)
 }
 
+func (k Keeper) DeleteValidatorByConsAddr(ctx sdk.Context, consAddr sdk.ConsAddress) {
+	store := ctx.KVStore(k.storeKey)
+	store.Delete(types.GetValidatorByConsAddrKey(consAddr))
+}
+
 // SetValidatorByPowerIndex sets the power index key of an unjailed validator
 func (k Keeper) SetValidatorByPowerIndex(ctx sdk.Context, validator types.Validator) {
 	// jailed validators are not kept in the power index
diff --git a/x/staking/types/errors.go b/x/staking/types/errors.go
index e9ccfd8724..fddc5a962f 100644
--- a/x/staking/types/errors.go
+++ b/x/staking/types/errors.go
@@ -58,17 +58,24 @@ const (
 	CodeNoDelegatorExisted              uint32 = 67044
 	CodeTargetValsDuplicate             uint32 = 67045
 	CodeAlreadyBound                    uint32 = 67046
+
+	CodePubkeyEqual uint32 = 67047
 )
 
 var (
-	ErrInvalidHistoricalInfo           = sdkerrors.Register(ModuleName, 144, "invalid historical info")
-	ErrNoHistoricalInfo                = sdkerrors.Register(ModuleName, 145, "no historical info found")
+	ErrInvalidHistoricalInfo = sdkerrors.Register(ModuleName, 144, "invalid historical info")
+	ErrNoHistoricalInfo      = sdkerrors.Register(ModuleName, 145, "no historical info found")
 )
+
 // ErrNoValidatorFound returns an error when a validator doesn't exist
 func ErrNoValidatorFound(valAddr string) sdk.EnvelopedErr {
 	return sdk.EnvelopedErr{Err: sdkerrors.New(DefaultCodespace, CodeNoValidatorFound, fmt.Sprintf("validator %s does not exist", valAddr))}
 }
 
+func ErrPubkeyEqual(pubkey string) sdk.EnvelopedErr {
+	return sdk.EnvelopedErr{Err: sdkerrors.New(DefaultCodespace, CodePubkeyEqual, fmt.Sprintf("validator pubkey %s does exist", pubkey))}
+}
+
 // ErrInvalidDelegation returns an error when the delegation is invalid
 func ErrInvalidDelegation(delegator string) sdk.EnvelopedErr {
 	return sdk.EnvelopedErr{Err: sdkerrors.New(DefaultCodespace, CodeInvalidDelegation,
diff --git a/x/staking/types/expected_keepers.go b/x/staking/types/expected_keepers.go
index 781a0e5afb..82aaec3ce4 100644
--- a/x/staking/types/expected_keepers.go
+++ b/x/staking/types/expected_keepers.go
@@ -4,6 +4,7 @@ import (
 	sdk "github.com/okex/exchain/libs/cosmos-sdk/types"
 	authexported "github.com/okex/exchain/libs/cosmos-sdk/x/auth/exported"
 	supplyexported "github.com/okex/exchain/libs/cosmos-sdk/x/supply/exported"
+	"github.com/okex/exchain/libs/tendermint/crypto"
 	stakingexported "github.com/okex/exchain/x/staking/exported"
 )
 
@@ -74,6 +75,7 @@ type ValidatorSet interface {
 type StakingHooks interface {
 	// Must be called when a validator is created
 	AfterValidatorCreated(ctx sdk.Context, valAddr sdk.ValAddress)
+	AfterValidatorPubkeyChanged(ctx sdk.Context, oldAddress sdk.ConsAddress, newAddress sdk.ConsAddress, newPubkey crypto.PubKey)
 	// Must be called when a validator's state changes
 	BeforeValidatorModified(ctx sdk.Context, valAddr sdk.ValAddress)
 	// Must be called when a validator is deleted
diff --git a/x/staking/types/hooks.go b/x/staking/types/hooks.go
index c2170d7e10..14a6af1866 100644
--- a/x/staking/types/hooks.go
+++ b/x/staking/types/hooks.go
@@ -2,6 +2,7 @@ package types
 
 import (
 	sdk "github.com/okex/exchain/libs/cosmos-sdk/types"
+	"github.com/okex/exchain/libs/tendermint/crypto"
 )
 
 // MultiStakingHooks combines multiple staking hooks, all hook functions are run in array sequence
@@ -20,6 +21,12 @@ func (h MultiStakingHooks) AfterValidatorCreated(ctx sdk.Context, valAddr sdk.Va
 	}
 }
 
+func (h MultiStakingHooks) AfterValidatorPubkeyChanged(ctx sdk.Context, oldAddress sdk.ConsAddress, newAddress sdk.ConsAddress, newPubkey crypto.PubKey) {
+	for i := range h {
+		h[i].AfterValidatorPubkeyChanged(ctx, oldAddress, newAddress, newPubkey)
+	}
+}
+
 // BeforeValidatorModified handles the hooks before the validator modified
 func (h MultiStakingHooks) BeforeValidatorModified(ctx sdk.Context, valAddr sdk.ValAddress) {
 	for i := range h {
diff --git a/x/staking/types/keys.go b/x/staking/types/keys.go
index 71b71f7c8b..ab6605d181 100644
--- a/x/staking/types/keys.go
+++ b/x/staking/types/keys.go
@@ -30,7 +30,7 @@ const (
 	RouterKey = ModuleName
 )
 
-//nolint
+// nolint
 var (
 	// Keys for store prefixes
 	// Last* values are constant during a block.
@@ -40,6 +40,7 @@ var (
 	ValidatorsKey             = []byte{0x21} // prefix for each key to a validator
 	ValidatorsByConsAddrKey   = []byte{0x22} // prefix for each key to a validator index, by pubkey
 	ValidatorsByPowerIndexKey = []byte{0x23} // prefix for each key to a validator index, sorted by power
+	ValChangePubkeyKey        = []byte{0x24}
 
 	ValidatorQueueKey = []byte{0x43} // prefix for the timestamps in validator queue
 
@@ -67,6 +68,10 @@ func GetValidatorByConsAddrKey(addr sdk.ConsAddress) []byte {
 	return append(ValidatorsByConsAddrKey, addr.Bytes()...)
 }
 
+func GetValidatorChangePubkeyKey(operatorAddr sdk.ValAddress) []byte {
+	return append(ValChangePubkeyKey, operatorAddr.Bytes()...)
+}
+
 // AddressFromLastValidatorPowerKey gets the validator operator address from LastValidatorPowerKey
 func AddressFromLastValidatorPowerKey(key []byte) []byte {
 	return key[1:] // remove prefix bytes
diff --git a/x/staking/types/msg.go b/x/staking/types/msg.go
index d458fbfc91..491525369b 100644
--- a/x/staking/types/msg.go
+++ b/x/staking/types/msg.go
@@ -162,7 +162,7 @@ func (msg MsgEditValidator) ValidateBasic() error {
 	}
 
 	if msg.Description == (Description{}) {
-		return ErrNilValidatorAddr()
+		return ErrDescriptionIsEmpty()
 	}
 
 	return nil