中文摘要：

依据耐用品的市场容量随着时间发生变化的特点，修正了传统的Bertrand竞争模型，得到两阶段情形下的两个企业同时博弈的耐用品动态Bertrand模型及其所对应的价格均衡解。通过对模型的比较与分析可知，新模型是对传统模型的进一步扩展，并且能够适用于更为实际的竞争情形。

英文摘要：

In view of the property that the market capacity for durable goods vareis with time, we propose a modified dynamical Bertrand model with duopoly＇s simultaneous-move game of two stages. Whose equilibrium solutions are obtained for corresponding price. Our analysis shows that the new model is extension to the traditional one, and it can apply to more practical competition case.