In order to improve the bandwidth of bidirectional Green-band in trunk coordinated signal control, a method of setting Green-band bandwidth based on phase sequence adjustment is proposed. It is analyzed that the bandwidth of bidirectional green wave band corresponding to the phase sequence of intersections is the largest when the difference between the horizontal distance between the green wave band centerline intersections of two intersections and the sum of the remainder of the spacing between ideal intersections is the smallest. Based on the time-distance diagram, a phase sequence adjustment method for improving the bandwidth of green band in bidirectional green wave control is proposed, and the specific implementation steps are given. Taking seven consecutive intersections of a main road as an example, the green wave control results before and after phase sequence adjustment are compared and analyzed. The research results show that the green wave design method of phase sequence adjustment can effectively improve the bandwidth of bidirectional green wave band, and through the VISSIM simulation test, the average travel time, delay and parking times of vehicles in the up and down direction of the green wave design method of phase sequence adjustment are reduced to varying degrees.