In this paper, the eight major cities in Sichuan province along ChengLan Railway are taken as an example,according to the relevant measure of economic status, firstly,by using grey prediction, the comprehensive economic situation of each city in the next ten years is predicted through comprehensive GDP data in recent years,it further tells its economic benefits brought by ChengLan Railway. Secondly, considering the relation of city traffic and many economy factors, internal dependencies of multiple variables are studied by using factor analysis and the direction of development of each city is determined. Finally, we put forward reasonable suggestions with the current situation of each city.