In order to solve the increasingly serious traffic problems in the city, how to achieve effective management and control of the traffic information has become an urgent problem that should be solved in transportation of our country. This paper proposes a design on traffic signal of wireless sensor network based on LabVIEW, including traffic signal controller, GPRS wireless modem and LabVIEW interface. It adopts GPRS wireless telecommunication as the method to transport the data of traffic

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... control. This method could solve the problem of high costs and the difficult problems in using wired telecommunication cable system. Traffic signal device adopts Single Chip Microcomputer to control, introduces the information collection module by using the front-end of the HMC5883L Magnetoresistive Sensor. It describes the GPRS technology and relating properties. The traffic signal monitor interface designed by LabVIEW software, and achieves the control of traffic signal.