Trunk traffic is the main body of urban traffic system. It is very important for the overall development of urban traffic to design a reasonable trunk coordinated signal control scheme and improve the efficiency of trunk traffic by using reasonable methods. Firstly, by using the American Electrical Manufacturing Association's double-loop and double-section signal control method, according to the relationship of green light turning on time in the coordinated direction of trunk line, and using the diversity of signal phase overlap or discontinuous part values，this paper analyses the relationship between the time that green light start-up and the length of the green light at each intersection of the trunk line, and establishes a two-way green wave bandwidth maximization model for the trunk line.Then, it takes 8 consecutive intersection of Zhongshan Street in Yinchuan city as an example, designs a green wave signal control scheme based on the green wave model. Finally, this paper simulates the signal timing schemes before and after optimization and The correctness and practicability is validated with it. Key words: Trunk coordinated signal control; Common period; Green signal ratio; Bidirectional greenwave; Simulation

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