There is no special right of way for trams and there are intersections with social vehicles. Therefore, signal priority and operation and driving safety are the two major problems faced by trams. At the same time, the tram can not give full play to the advantages of the medium traffic volume and the normal traffic of the tram signal system. According to the nature and regional characteristics of different intersections, measures such as absolute priority, relative priority, extension of green light and shortening of red light shall be reasonably taken to meet the priority of tram traffic.