With the improvement of China's expressway, how to use expressway economically and safely has became an important problem. Setting up more roads simply, and extending the road net scale can not meet the increasing transportation need. Application of Hi-tech, e.g. modern information and communication technique, to reform the current road system and its management system, can significantly increase the traffic capacity and the service quality of road net. Intelligence transportation system (ITS) is a direction to transport development, and also an important measure to solve the transportation conveyance bottleneck. This thesis, based on the detailed data, analyzed present developing condition of China’s expressway first, then analyzed the overseas expressway development experience, and finally expatiated the necessity of ITS used in China´s expressway by taking the Sichuan Province ITS project as an example.