diff --git a/CHANGELOG.md b/CHANGELOG.md
index b12492401..2d0751b7a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## v0.2.5-alpha.3
+This release is a bugfix release.
+
+Bugfixes:
+* [#470](https://github.com/bnb-chain/greenfield/pull/470) fix: testnet block sync issue
+* [#471](https://github.com/bnb-chain/greenfield/pull/471) fix: some issues in challenge module
+
 ## v0.2.5-alpha.2
 This release contains 1 bugfix.
 * [#465](https://github.com/bnb-chain/greenfield/pull/465) fix: remaining policies need re-persistence
diff --git a/x/challenge/keeper/msg_server_attest.go b/x/challenge/keeper/msg_server_attest.go
index 27f284211..94372057b 100644
--- a/x/challenge/keeper/msg_server_attest.go
+++ b/x/challenge/keeper/msg_server_attest.go
@@ -4,6 +4,8 @@ import (
 	"context"
 	"math/big"
 
+	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
+
 	"cosmossdk.io/errors"
 	sdkmath "cosmossdk.io/math"
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -16,6 +18,9 @@ import (
 	storagetypes "github.com/bnb-chain/greenfield/x/storage/types"
 )
 
+// one_gb_bytes stands for the total bytes in 1gb
+const one_gb_bytes = 1024 * 1024 * 1024
+
 // Attest handles user's request for attesting a challenge.
 // The attestation can include a valid challenge or is only for heartbeat purpose.
 // If the challenge is valid, the related storage provider will be slashed.
@@ -145,8 +150,8 @@ func (k msgServer) Attest(goCtx context.Context, msg *types.MsgAttest) (*types.M
 func (k msgServer) calculateSlashAmount(ctx sdk.Context, objectSize uint64) sdkmath.Int {
 	params := k.GetParams(ctx)
 	sizeRate := params.SlashAmountSizeRate
-	objectSizeInGB := sdk.NewDecFromBigInt(new(big.Int).SetUint64(objectSize)).QuoRoundUp(sdk.NewDec(1073741824))
-	slashAmount := objectSizeInGB.MulMut(sizeRate).MulMut(sdk.NewDec(1e18)).TruncateInt()
+	objectSizeInGB := sdk.NewDecFromBigInt(new(big.Int).SetUint64(objectSize)).QuoRoundUp(sdk.NewDec(one_gb_bytes))
+	slashAmount := objectSizeInGB.Mul(sizeRate).Mul(sdk.NewDec(1e18)).TruncateInt()
 
 	min := params.SlashAmountMin
 	if slashAmount.LT(min) {
@@ -195,40 +200,46 @@ func (k msgServer) calculateSlashRewards(ctx sdk.Context, total sdkmath.Int, cha
 func (k msgServer) doSlashAndRewards(ctx sdk.Context, challengeId uint64, voteResult types.VoteResult, slashAmount sdkmath.Int,
 	spID uint32, submitter, challenger sdk.AccAddress, validators []string) error {
 
-	challengerReward, eachValidatorReward, submitterReward := k.calculateSlashRewards(ctx, slashAmount,
-		challenger, int64(len(validators)))
+	challengerReward, eachValidatorReward, submitterReward := sdkmath.ZeroInt(), sdkmath.ZeroInt(), sdkmath.ZeroInt()
 
-	denom := k.SpKeeper.DepositDenomForSP(ctx)
-	rewards := make([]sptypes.RewardInfo, 0)
-	if !challenger.Equals(sdk.AccAddress{}) {
-		rewards = append(rewards, sptypes.RewardInfo{
-			Address: challenger.String(),
-			Amount: sdk.Coin{
-				Denom:  denom,
-				Amount: challengerReward,
-			},
-		})
-	}
-	for _, val := range validators {
+	noNeedCalculation := ctx.IsUpgraded(upgradetypes.Nagqu) && slashAmount.IsZero()
+
+	if !noNeedCalculation {
+		challengerReward, eachValidatorReward, submitterReward = k.calculateSlashRewards(ctx, slashAmount,
+			challenger, int64(len(validators)))
+
+		denom := k.SpKeeper.DepositDenomForSP(ctx)
+		rewards := make([]sptypes.RewardInfo, 0)
+		if !challenger.Equals(sdk.AccAddress{}) {
+			rewards = append(rewards, sptypes.RewardInfo{
+				Address: challenger.String(),
+				Amount: sdk.Coin{
+					Denom:  denom,
+					Amount: challengerReward,
+				},
+			})
+		}
+		for _, val := range validators {
+			rewards = append(rewards, sptypes.RewardInfo{
+				Address: val,
+				Amount: sdk.Coin{
+					Denom:  denom,
+					Amount: eachValidatorReward,
+				},
+			})
+		}
 		rewards = append(rewards, sptypes.RewardInfo{
-			Address: val,
+			Address: submitter.String(),
 			Amount: sdk.Coin{
 				Denom:  denom,
-				Amount: eachValidatorReward,
-			},
-		})
-	}
-	rewards = append(rewards, sptypes.RewardInfo{
-		Address: submitter.String(),
-		Amount: sdk.Coin{
-			Denom:  denom,
-			Amount: submitterReward,
-		}})
-
-	if challengerReward.IsPositive() || eachValidatorReward.IsPositive() || submitterReward.IsPositive() {
-		err := k.SpKeeper.Slash(ctx, spID, rewards)
-		if err != nil {
-			return err
+				Amount: submitterReward,
+			}})
+
+		if challengerReward.IsPositive() || eachValidatorReward.IsPositive() || submitterReward.IsPositive() {
+			err := k.SpKeeper.Slash(ctx, spID, rewards)
+			if err != nil {
+				return err
+			}
 		}
 	}
 
diff --git a/x/challenge/keeper/msg_server_submit.go b/x/challenge/keeper/msg_server_submit.go
index d42b723f2..46aadba1d 100644
--- a/x/challenge/keeper/msg_server_submit.go
+++ b/x/challenge/keeper/msg_server_submit.go
@@ -36,6 +36,9 @@ func (k msgServer) Submit(goCtx context.Context, msg *types.MsgSubmit) (*types.M
 	if objectInfo.ObjectStatus != storagetypes.OBJECT_STATUS_SEALED {
 		return nil, types.ErrInvalidObjectStatus
 	}
+	if objectInfo.PayloadSize == 0 {
+		return nil, errors.Wrap(types.ErrInvalidSegmentIndex, "the object is empty, no segment")
+	}
 
 	// check whether the sp stores the object info, generate redundancy index
 	stored := false
diff --git a/x/payment/keeper/msg_server_withdraw.go b/x/payment/keeper/msg_server_withdraw.go
index cd8ed6876..e9194b50d 100644
--- a/x/payment/keeper/msg_server_withdraw.go
+++ b/x/payment/keeper/msg_server_withdraw.go
@@ -15,7 +15,6 @@ func (k msgServer) Withdraw(goCtx context.Context, msg *types.MsgWithdraw) (*typ
 	ctx := sdk.UnwrapSDKContext(goCtx)
 	creator := sdk.MustAccAddressFromHex(msg.Creator)
 
-	params := k.GetParams(ctx)
 	if ctx.IsUpgraded(upgradetypes.Nagqu) {
 		if msg.From == "" { // withdraw from the locked one
 			delayedWithdrawal, found := k.GetDelayedWithdrawalRecord(ctx, creator)
@@ -79,6 +78,7 @@ func (k msgServer) Withdraw(goCtx context.Context, msg *types.MsgWithdraw) (*typ
 	}
 
 	if ctx.IsUpgraded(upgradetypes.Nagqu) {
+		params := k.GetParams(ctx)
 		if msg.Amount.GTE(*params.WithdrawTimeLockThreshold) {
 			// check whether there is delayed withdrawal, if there is delayed withdrawal, must withdraw it firstly
 			if _, found := k.GetDelayedWithdrawalRecord(ctx, creator); found {