本文在追求差别化市场条件下研究了双头垄断模型的纳什均衡。首先提出了追求差别化市场的概念,对考虑和不考虑固定成本的情形讨论了生产同型产品时的纳什均衡;其次对生产不同型产品且具有相同替代系数时的纳什均衡进行了研究;最后分析了生产不同型产品且具有不同替代系数时的纳什均衡。 This paper studies the Nash equilibrium of the duopoly model under the condition of pursuing the differentiated market. Firstly, the concept of pursuing differentiated markets is put forward, and the Nash equilibrium when producing same-type products is considered with or without consideration of fixed costs. Secondly, the Nash equilibrium when producing different types of products with the same substitute coefficient is studied. Finally, Nash equilibrium for producing different types of products with different substitution coefficients.