For establishing long-term mechanism to solve overload and oversize transportation, authors firstly established a mathematic model to evaluate transportation enterprises income, and analysed relation between profit and price, transportaion cost, and fine because of overload. And then, authors analysed how an enterprise could earn the biggest profit. On the basis of reviewing characteristics of Chinese freight transportation market, authors analysed possible behavior choice of transportation operator according to game theory. Learning experience of solution to overload and oversize transportation from United States, authors analysed 4 enforcement measures, and their characteristics and effects.Authors gave advice to Chinese situation on the basis of analysis above.In order to promote performance of solution to overload, suggestions on government regulation and economic measure were stated at the end of the paper and it would play an active role on overload and oversize transportation.