diff --git a/pkg/bbgo/environment.go b/pkg/bbgo/environment.go
index d2043507e..b7d2358c4 100644
--- a/pkg/bbgo/environment.go
+++ b/pkg/bbgo/environment.go
@@ -213,7 +213,7 @@ func (environ *Environment) AddExchangesByViperKeys() error {
 
 func (environ *Environment) AddExchangesFromSessionConfig(sessions map[string]*ExchangeSession) error {
 	for sessionName, session := range sessions {
-		if err := InitExchangeSession(sessionName, session); err != nil {
+		if err := InitExchangeSession(sessionName, session, nil); err != nil {
 			return err
 		}
 
diff --git a/pkg/bbgo/session.go b/pkg/bbgo/session.go
index 2a5cac831..f0d4a20df 100644
--- a/pkg/bbgo/session.go
+++ b/pkg/bbgo/session.go
@@ -680,20 +680,21 @@ func (session *ExchangeSession) FindPossibleSymbols() (symbols []string, err err
 	return symbols, nil
 }
 
-func InitExchangeSession(name string, session *ExchangeSession) error {
+func InitExchangeSession(name string, session *ExchangeSession, exchange types.Exchange) error {
 	var err error
 	var exchangeName = session.ExchangeName
-	var exchange types.Exchange
-	if session.Key != "" && session.Secret != "" {
-		if !session.PublicOnly {
-			if len(session.Key) == 0 || len(session.Secret) == 0 {
-				return fmt.Errorf("can not create exchange %s: empty key or secret", exchangeName)
+	if exchange == nil {
+		if session.Key != "" && session.Secret != "" {
+			if !session.PublicOnly {
+				if len(session.Key) == 0 || len(session.Secret) == 0 {
+					return fmt.Errorf("can not create exchange %s: empty key or secret", exchangeName)
+				}
 			}
-		}
 
-		exchange, err = cmdutil.NewExchangeStandard(exchangeName, session.Key, session.Secret, "", session.SubAccount)
-	} else {
-		exchange, err = cmdutil.NewExchangeWithEnvVarPrefix(exchangeName, session.EnvVarPrefix)
+			exchange, err = cmdutil.NewExchangeStandard(exchangeName, session.Key, session.Secret, "", session.SubAccount)
+		} else {
+			exchange, err = cmdutil.NewExchangeWithEnvVarPrefix(exchangeName, session.EnvVarPrefix)
+		}
 	}
 
 	if err != nil {
diff --git a/pkg/cmd/backtest.go b/pkg/cmd/backtest.go
index e30271562..a99e0b969 100644
--- a/pkg/cmd/backtest.go
+++ b/pkg/cmd/backtest.go
@@ -127,10 +127,14 @@ var BacktestCmd = &cobra.Command{
 
 		for key, session := range userConfig.Sessions {
 			if exchangeNameStr == key {
-				err := bbgo.InitExchangeSession(session.Name, session)
+				publicExchange, err := cmdutil.NewExchangeStandard(session.ExchangeName, "", "", "", "")
 				if err != nil {
 					return err
 				}
+
+				if err := bbgo.InitExchangeSession(session.Name, session, publicExchange) ; err != nil {
+					return err
+				}
 				sourceExchange = session.Exchange
 				exchangeName = session.ExchangeName
 			}
@@ -142,7 +146,7 @@ var BacktestCmd = &cobra.Command{
 				return err
 			}
 
-			sourceExchange, err = cmdutil.NewExchange(exchangeName)
+			sourceExchange, err = cmdutil.NewExchangeStandard(exchangeName, "", "", "", "")
 			if err != nil {
 				return err
 			}
diff --git a/pkg/server/routes.go b/pkg/server/routes.go
index d428f0270..97a2a4434 100644
--- a/pkg/server/routes.go
+++ b/pkg/server/routes.go
@@ -133,7 +133,7 @@ func (s *Server) newEngine() *gin.Engine {
 			return
 		}
 
-		err := bbgo.InitExchangeSession(session.ExchangeName.String(), &session)
+		err := bbgo.InitExchangeSession(session.ExchangeName.String(), &session, nil)
 		if err != nil {
 			c.JSON(http.StatusInternalServerError, gin.H{
 				"error": err.Error(),
@@ -182,7 +182,7 @@ func (s *Server) newEngine() *gin.Engine {
 			return
 		}
 
-		if err := bbgo.InitExchangeSession(session.ExchangeName.String(), &session); err != nil {
+		if err := bbgo.InitExchangeSession(session.ExchangeName.String(), &session, nil); err != nil {
 			c.JSON(http.StatusInternalServerError, gin.H{
 				"error": err.Error(),
 			})