diff --git a/broker.go b/broker.go
index cc5f7c1..d76aecf 100644
--- a/broker.go
+++ b/broker.go
@@ -15,9 +15,9 @@ type Broker interface {
 	GetOrderBook(symbol string, depth int) (result OrderBook, err error)
 
 	// 设置合约类型
-	// pair: 交易对，如: BTC-USD(OKEX) BTC(HBDM)
+	// currencyPair: 交易对，如: BTC-USD(OKEX) BTC(HBDM)
 	// contractType: W1,W2,Q1,Q2
-	SetContractType(pair string, contractType string) (err error)
+	SetContractType(currencyPair string, contractType string) (err error)
 
 	// 获取当前设置的合约ID
 	GetContractID() (symbol string, err error)
diff --git a/brokers/bitmex-broker/broker.go b/brokers/bitmex-broker/broker.go
index 0cd4eb4..8d6b31b 100644
--- a/brokers/bitmex-broker/broker.go
+++ b/brokers/bitmex-broker/broker.go
@@ -10,6 +10,7 @@ import (
 // BitMEXBroker the BitMEX broker
 type BitMEXBroker struct {
 	client *bitmex.BitMEX
+	symbol string
 }
 
 func (b *BitMEXBroker) GetName() (name string) {
@@ -54,12 +55,13 @@ func (b *BitMEXBroker) GetOrderBook(symbol string, depth int) (result OrderBook,
 	return
 }
 
-func (b *BitMEXBroker) SetContractType(pair string, contractType string) (err error) {
+func (b *BitMEXBroker) SetContractType(currencyPair string, contractType string) (err error) {
+	b.symbol = currencyPair
 	return
 }
 
 func (b *BitMEXBroker) GetContractID() (symbol string, err error) {
-	return
+	return b.symbol, nil
 }
 
 func (b *BitMEXBroker) SetLeverRate(value float64) (err error) {
diff --git a/brokers/bitmex-sim-broker/broker.go b/brokers/bitmex-sim-broker/broker.go
index 85bbd6a..c4ce600 100644
--- a/brokers/bitmex-sim-broker/broker.go
+++ b/brokers/bitmex-sim-broker/broker.go
@@ -32,6 +32,8 @@ type BitMEXSimBroker struct {
 	openOrders    map[string]*Order    // Open orders
 	historyOrders map[string]*Order    // History orders
 	positions     map[string]*Position // Position key: symbol
+
+	symbol string
 }
 
 func (b *BitMEXSimBroker) GetName() (name string) {
@@ -68,12 +70,13 @@ func (b *BitMEXSimBroker) GetOrderBook(symbol string, depth int) (result OrderBo
 	return
 }
 
-func (b *BitMEXSimBroker) SetContractType(pair string, contractType string) (err error) {
+func (b *BitMEXSimBroker) SetContractType(currencyPair string, contractType string) (err error) {
+	b.symbol = currencyPair
 	return
 }
 
 func (b *BitMEXSimBroker) GetContractID() (symbol string, err error) {
-	return
+	return b.symbol, nil
 }
 
 func (b *BitMEXSimBroker) SetLeverRate(value float64) (err error) {
diff --git a/brokers/bybit-broker/broker.go b/brokers/bybit-broker/broker.go
index 0fc00f7..8de3ff0 100644
--- a/brokers/bybit-broker/broker.go
+++ b/brokers/bybit-broker/broker.go
@@ -11,6 +11,7 @@ import (
 // BybitBroker the Bybit broker
 type BybitBroker struct {
 	client *rest.ByBit
+	symbol string
 }
 
 func (b *BybitBroker) GetName() (name string) {
@@ -59,12 +60,13 @@ func (b *BybitBroker) GetOrderBook(symbol string, depth int) (result OrderBook,
 	return
 }
 
-func (b *BybitBroker) SetContractType(pair string, contractType string) (err error) {
+func (b *BybitBroker) SetContractType(currencyPair string, contractType string) (err error) {
+	b.symbol = currencyPair
 	return
 }
 
 func (b *BybitBroker) GetContractID() (symbol string, err error) {
-	return
+	return b.symbol, nil
 }
 
 func (b *BybitBroker) SetLeverRate(value float64) (err error) {
diff --git a/brokers/deribit-broker/broker.go b/brokers/deribit-broker/broker.go
index f303ce8..4feda6b 100644
--- a/brokers/deribit-broker/broker.go
+++ b/brokers/deribit-broker/broker.go
@@ -98,7 +98,7 @@ func (b *DiribitBroker) GetOrderBook(symbol string, depth int) (result OrderBook
 	return
 }
 
-func (b *DiribitBroker) SetContractType(pair string, contractType string) (err error) {
+func (b *DiribitBroker) SetContractType(currencyPair string, contractType string) (err error) {
 	return
 }