diff --git a/pkg/strategy/swing/strategy.go b/pkg/strategy/swing/strategy.go
index b6c4a466f..9c8cf1782 100644
--- a/pkg/strategy/swing/strategy.go
+++ b/pkg/strategy/swing/strategy.go
@@ -121,7 +121,7 @@ func (s *Strategy) Run(ctx context.Context, orderExecutor bbgo.OrderExecutor, se
 
 		trend := kline.GetTrend()
 		switch trend {
-		case 1:
+		case types.TrendUp:
 			// if it goes up and it's above the moving average price, then we sell
 			if closePrice > movingAveragePrice {
 				s.notify(":chart_with_upwards_trend: closePrice %f is above movingAveragePrice %f, submitting SELL order", closePrice, movingAveragePrice)
@@ -137,7 +137,7 @@ func (s *Strategy) Run(ctx context.Context, orderExecutor bbgo.OrderExecutor, se
 					log.WithError(err).Error("submit order error")
 				}
 			}
-		case -1:
+		case types.TrendDown:
 			// if it goes down and it's below the moving average price, then we buy
 			if closePrice < movingAveragePrice {
 				s.notify(":chart_with_downwards_trend: closePrice %f is below movingAveragePrice %f, submitting BUY order", closePrice, movingAveragePrice)
diff --git a/pkg/types/kline.go b/pkg/types/kline.go
index 6061cd43e..d4c1f4ebb 100644
--- a/pkg/types/kline.go
+++ b/pkg/types/kline.go
@@ -10,6 +10,12 @@ import (
 	"github.com/c9s/bbgo/pkg/util"
 )
 
+type Trend int
+
+const TrendUp = 1
+const TrendFlat = 0
+const TrendDown = -1
+
 type KLineOrWindow interface {
 	GetInterval() string
 	GetTrend() int
@@ -87,16 +93,16 @@ func (k KLine) BounceDown() bool {
 	return trend > 0 && k.Open < mid && k.Close < mid
 }
 
-func (k KLine) GetTrend() int {
+func (k KLine) GetTrend() Trend {
 	o := k.GetOpen()
 	c := k.GetClose()
 
 	if c > o {
-		return 1
+		return TrendUp
 	} else if c < o {
-		return -1
+		return TrendDown
 	}
-	return 0
+	return TrendFlat
 }
 
 func (k KLine) GetHigh() float64 {
@@ -442,4 +448,3 @@ func (k KLineWindow) SlackAttachment() slack.Attachment {
 }
 
 type KLineCallback func(kline KLine)
-