With the development of China's economy and the acceleration of global economic integra-tion ,more and more large-scale petrochemical ,power ,Heavy project began construction in the coun-try ,making the domestic international exceed the standard dimensions and weight of large equipment transport devices become increasingly frequent .In order to improve the safety and efficiency of large transport ,through a lot of investigation ,based on the supply and demand of large transport ,combi-ning of traffic engineering knowledge and the characteristics of the large transport ,considering of the feasible and economically viable ,timeliness ,extended four aspects of a comprehensive analysis are choosen to determine the principles of the large transport line selection .Objective optimization theory is applyed to preferably the east-west and the north-south highway transport route ,which provides a theoretical basis to build a large transport intermodal network in the country .%为了提高大件运输的安全性和效率，通过大量的实际调查，以大件运输的供需出发，结合交通工程学的知识和大件运输的特点，从可行、经济、时效、扩展四方面进行综合分析确定大件运输选线的原则，并应用目标最优化理论，优选出东西、南北方向的公路运输线路线。
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