diff --git a/workflow.go b/workflow.go
index d11c47a..cb45fd8 100644
--- a/workflow.go
+++ b/workflow.go
@@ -197,28 +197,20 @@ func (wf *Workflow) SetBodyParams(params ...interface{}) *Workflow {
 	return wf
 }
 
-func mergeMapList(header1, header2 map[string][]string) map[string][]string {
+func mergeMapList(headers ...map[string][]string) map[string][]string {
 
 	set := make(map[string]map[string]int)
 	merged := make(map[string][]string)
 
-	for key, values := range header1 {
-		for _, v := range values {
-			if vs, ok := set[key]; ok {
-				vs[v] = 1
-			} else {
-				set[key] = make(map[string]int)
-				set[key][v] = 1
-			}
-		}
-	}
-	for key, values := range header2 {
-		for _, v := range values {
-			if vs, ok := set[key]; ok {
-				vs[v] = 1
-			} else {
-				set[key] = make(map[string]int)
-				set[key][v] = 1
+	for _, header := range headers {
+		for key, values := range header {
+			for _, v := range values {
+				if vs, ok := set[key]; ok {
+					vs[v] = 1
+				} else {
+					set[key] = make(map[string]int)
+					set[key][v] = 1
+				}
 			}
 		}
 	}
@@ -239,7 +231,7 @@ func mergeMapList(header1, header2 map[string][]string) map[string][]string {
 
 // setHeaderRequest 设置request的头
 func setHeaderRequest(req *http.Request, wf *Workflow) {
-	req.Header = mergeMapList(req.Header, mergeMapList(wf.session.Header, wf.Header))
+	req.Header = mergeMapList(req.Header, wf.session.Header, wf.Header)
 }
 
 // setHeaderRequest 设置request的临时Cookie, 永久需要在session上设置cookie