diff --git a/pkg/strategy/xfunding/strategy.go b/pkg/strategy/xfunding/strategy.go
index b4f93456ac..c1ee02dedf 100644
--- a/pkg/strategy/xfunding/strategy.go
+++ b/pkg/strategy/xfunding/strategy.go
@@ -347,56 +347,6 @@ func (s *Strategy) queryAndDetectPremiumIndex(ctx context.Context, binanceFuture
 	}
 }
 
-// TODO: replace type binance.Exchange with an interface
-func (s *Strategy) transferIn(ctx context.Context, ex *binance.Exchange, trade types.Trade) error {
-	currency := s.spotMarket.BaseCurrency
-
-	// base asset needs BUY trades
-	if trade.Side == types.SideTypeSell {
-		return nil
-	}
-
-	balances, err := ex.QueryAccountBalances(ctx)
-	if err != nil {
-		return err
-	}
-
-	b, ok := balances[currency]
-	if !ok {
-		return fmt.Errorf("%s balance not found", currency)
-	}
-
-	// TODO: according to the fee, we might not be able to get enough balance greater than the trade quantity, we can adjust the quantity here
-	if b.Available.Compare(trade.Quantity) < 0 {
-		log.Infof("adding to pending base transfer: %s %s", trade.Quantity, currency)
-		s.State.PendingBaseTransfer = s.State.PendingBaseTransfer.Add(trade.Quantity)
-		return nil
-	}
-
-	amount := s.State.PendingBaseTransfer.Add(trade.Quantity)
-
-	pos := s.SpotPosition.GetBase()
-	rest := pos.Sub(s.State.TotalBaseTransfer)
-
-	if rest.Sign() < 0 {
-		return nil
-	}
-
-	amount = fixedpoint.Min(rest, amount)
-
-	log.Infof("transfering futures account asset %s %s", amount, currency)
-	if err := ex.TransferFuturesAccountAsset(ctx, currency, amount, types.TransferIn); err != nil {
-		return err
-	}
-
-	// reset pending transfer
-	s.State.PendingBaseTransfer = fixedpoint.Zero
-
-	// record the transfer in the total base transfer
-	s.State.TotalBaseTransfer = s.State.TotalBaseTransfer.Add(amount)
-	return nil
-}
-
 func (s *Strategy) triggerPositionAction(ctx context.Context) {
 	switch s.positionAction {
 	case PositionOpening:
@@ -622,9 +572,17 @@ func (s *Strategy) detectPremiumIndex(premiumIndex *types.PremiumIndex) (changed
 
 			s.positionAction = PositionOpening
 			s.positionType = types.PositionShort
+
+			// reset the transfer stats
+			s.State.PendingBaseTransfer = fixedpoint.Zero
+			s.State.TotalBaseTransfer = fixedpoint.Zero
 			changed = true
 		} else if fundingRate.Compare(s.ShortFundingRate.Low) <= 0 {
 			s.positionAction = PositionClosing
+
+			// reset the transfer stats
+			s.State.PendingBaseTransfer = fixedpoint.Zero
+			s.State.TotalBaseTransfer = fixedpoint.Zero
 			changed = true
 		}
 	}
diff --git a/pkg/strategy/xfunding/transfer.go b/pkg/strategy/xfunding/transfer.go
new file mode 100644
index 0000000000..00a34afdc7
--- /dev/null
+++ b/pkg/strategy/xfunding/transfer.go
@@ -0,0 +1,112 @@
+package xfunding
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/c9s/bbgo/pkg/fixedpoint"
+	"github.com/c9s/bbgo/pkg/types"
+)
+
+type FuturesTransfer interface {
+	TransferFuturesAccountAsset(ctx context.Context, asset string, amount fixedpoint.Value, io types.TransferDirection) error
+	QueryAccountBalances(ctx context.Context) (types.BalanceMap, error)
+}
+
+func (s *Strategy) transferOut(ctx context.Context, ex FuturesTransfer, trade types.Trade) error {
+	currency := s.spotMarket.BaseCurrency
+
+	// base asset needs BUY trades
+	if trade.Side == types.SideTypeBuy {
+		return nil
+	}
+
+	balances, err := ex.QueryAccountBalances(ctx)
+	if err != nil {
+		return err
+	}
+
+	b, ok := balances[currency]
+	if !ok {
+		return fmt.Errorf("%s balance not found", currency)
+	}
+
+	// TODO: according to the fee, we might not be able to get enough balance greater than the trade quantity, we can adjust the quantity here
+	if b.Available.Compare(trade.Quantity) < 0 {
+		log.Infof("adding to pending base transfer: %s %s", trade.Quantity, currency)
+		s.State.PendingBaseTransfer = s.State.PendingBaseTransfer.Add(trade.Quantity)
+		return nil
+	}
+
+	amount := s.State.PendingBaseTransfer.Add(trade.Quantity)
+
+	pos := s.SpotPosition.GetBase()
+	rest := pos.Sub(s.State.TotalBaseTransfer)
+
+	if rest.Sign() < 0 {
+		return nil
+	}
+
+	amount = fixedpoint.Min(rest, amount)
+
+	log.Infof("transfering out futures account asset %s %s", amount, currency)
+	if err := ex.TransferFuturesAccountAsset(ctx, currency, amount, types.TransferOut); err != nil {
+		return err
+	}
+
+	// reset pending transfer
+	s.State.PendingBaseTransfer = fixedpoint.Zero
+
+	// record the transfer in the total base transfer
+	s.State.TotalBaseTransfer = s.State.TotalBaseTransfer.Add(amount)
+	return nil
+}
+
+func (s *Strategy) transferIn(ctx context.Context, ex FuturesTransfer, trade types.Trade) error {
+	currency := s.spotMarket.BaseCurrency
+
+	// base asset needs BUY trades
+	if trade.Side == types.SideTypeSell {
+		return nil
+	}
+
+	balances, err := ex.QueryAccountBalances(ctx)
+	if err != nil {
+		return err
+	}
+
+	b, ok := balances[currency]
+	if !ok {
+		return fmt.Errorf("%s balance not found", currency)
+	}
+
+	// TODO: according to the fee, we might not be able to get enough balance greater than the trade quantity, we can adjust the quantity here
+	if b.Available.Compare(trade.Quantity) < 0 {
+		log.Infof("adding to pending base transfer: %s %s", trade.Quantity, currency)
+		s.State.PendingBaseTransfer = s.State.PendingBaseTransfer.Add(trade.Quantity)
+		return nil
+	}
+
+	amount := s.State.PendingBaseTransfer.Add(trade.Quantity)
+
+	pos := s.SpotPosition.GetBase()
+	rest := pos.Sub(s.State.TotalBaseTransfer)
+
+	if rest.Sign() < 0 {
+		return nil
+	}
+
+	amount = fixedpoint.Min(rest, amount)
+
+	log.Infof("transfering in futures account asset %s %s", amount, currency)
+	if err := ex.TransferFuturesAccountAsset(ctx, currency, amount, types.TransferIn); err != nil {
+		return err
+	}
+
+	// reset pending transfer
+	s.State.PendingBaseTransfer = fixedpoint.Zero
+
+	// record the transfer in the total base transfer
+	s.State.TotalBaseTransfer = s.State.TotalBaseTransfer.Add(amount)
+	return nil
+}