本文在Salinger和Lin提出的两阶段寡头古诺博弈模型的基础上,根据我国汽车产业的现状,改进了过去企业纵向关系研究的“两分法”模型,并添加了自制率、交易成本和规模经济等变量,分析了汽车生产企业选择零部件自制或外购的原因。并得出结论:最优一体化程度是上下游企业两阶段古诺博弈得到的纯战略纳什均衡结果;企业在选择自己的零部件自制率时,会比较外生交易成本、内生交易成本和规模经济的大小;由于汽车制造业规模经济显著、交易成本不断减少等原因,车企应该努力降低自身零部件自制率,进行适当的纵向分拆。 Based on the two-stage oligarch Cournot game model proposed by Salinger and Lin, this paper improves the “dichotomy” model of the past research on vertical relations according to the current situation of China’s automobile industry and adds the self-made ratio, transaction cost And economies of scale and other variables, analyzed the reasons why automobile manufacturers choose their own parts or outsourced parts. And it is concluded that the optimal degree of integration is the result of pure strategic Nash equilibrium obtained by the two-stage Cournot game of upstream and downstream enterprises. When enterprises choose their own component self-made rate, they will compare exogenous transaction costs, endogenous transaction costs and The size of the economy of scale; due to the significant economies of scale of the automobile manufacturing industry, transaction costs continue to decline and other reasons, car prices should strive to reduce their own parts self-made rate, the appropriate longitudinal spin-off.