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This design by using digital circuit of traffic lights control circuit design, to make the traffic lights control circuit with digital signal automatic control at the crossroads of two groups of red, yellow, green traffic light state conversion method, directing all kinds of vehicles and pedestrians safe passage, crossroads traffic management automation. Therefore, in the curriculum design, will be based on conventional design methods to realize the design of traffic control signal. This experiment is designed to train the ability to master the digital circuit, the traffic signal lamp control circuit design method. Design requirements: 1 weeks control: trunk road light 30 seconds, branch roads green 20 seconds 2 each from green to red, should be 5 seconds of yellow light as the transition 3 were treated with red, yellow, green light emitting diode signal lamp 4 the design of the timing display circuit.