Traffic system is a complicated system, to realize digital management of transportation system, it is necessary to obtain the digital information of all component, and build the database to save and organize the digital information. According to the distribution characteristics of traffic system, CORS is a good choice to finish this work. In this paper, the method of using CORS technology to acquisition digital data of traffic system is introduced detailed, and the method of building the database is provided at the same time, these can be a beneficial reference for construction of traffic information system.