diff --git a/db.go b/db.go
index c464abb..3622fff 100644
--- a/db.go
+++ b/db.go
@@ -332,7 +332,9 @@ func GetRow(dbName, table_name, alias string, titles string, join [][]string, wh
 			if len(joinitem) < 2 {
 				continue
 			}
-			if len(joinitem) == 3 {
+			if len(joinitem) == 4 {
+				sql_str = helper.StringJoin(sql_str, " ", joinitem[2], " join ", joinitem[0], " on ", joinitem[1])
+			} else if len(joinitem) == 3 {
 				sql_str = helper.StringJoin(sql_str, " ", joinitem[2], " join ", getTableName(dbName, joinitem[0]), " on ", joinitem[1])
 			} else { //默认左连接
 				sql_str = helper.StringJoin(sql_str, " left join ", getTableName(dbName, joinitem[0]), " on ", joinitem[1])
@@ -482,7 +484,9 @@ func FetchRows(dbName, table_name, alias string, titles string, join [][]string,
 			if len(joinitem) < 2 {
 				continue
 			}
-			if len(joinitem) == 3 {
+			if len(joinitem) == 4 {
+				sql_str = helper.StringJoin(sql_str, " ", joinitem[2], " join ", joinitem[0], " on ", joinitem[1])
+			} else if len(joinitem) == 3 {
 				sql_str = helper.StringJoin(sql_str, " ", joinitem[2], " join ", getTableName(dbName, joinitem[0]), " on ", joinitem[1])
 			} else { //默认左连接
 				sql_str = helper.StringJoin(sql_str, " left join ", getTableName(dbName, joinitem[0]), " on ", joinitem[1])