With the rapid development of urbanization, transportation plays a very important role in people′s life. Traffic lights can enhance road traffic management, reduce traffic accidents and improve traffic conditions. They are an essential part of transportation. In order to manage the traffic order more scientifically and efficiently, labview is the software development platform and the data acquisition card is the hardware foundation to complete the design of the intelligent signal system. System through the data acquisition card I/O interface for communication, data exchange, and in accordance with the algorithm for data processing. The system can achieve the normal operation of the traffic lights, realtime monitoring of traffic conditions, and according to traffic conditions control signal light onoff time and other functions, in order to achieve the intelligent traffic signal system provides a new way.