中文摘要：

这篇文章在一个不均匀的盒子中分析 R 与 D 投资决定。投资决定分享三个重要特征。首先，投资是完全不可逆的。第二，在从投资的未来回来上有二种不确定性；分别地在在 R 与 D 的技术上处理。第三，在不均匀的盒子中有战略竞争。这篇文章介绍最佳的投资阀值值；高度有效的公司(领导人) 的最佳的投资规则，；投资阀值珍视的表演被二个公司的竞争减少。最后，为二个公司的混合投资策略，每个公司独立行使的概率投资的选择，；二个公司同时行使的概率选择在纸被给。

英文摘要：

This article analyzes R ＆ D investment decisions in an asymmetrical case. The investment decisions share three important characteristics. First, the investment is completely irreversible. Second, there are two kinds of uncertainties over the future returns from the investment and over technology in R ＆ D process, respectively. Third, there is strategic competition in the asymmetrical case. This article presents the optimal investment threshold values and the optimal investment rule of high-efficient firm （leader）, and shows that the investment threshold values are reduced by competition of two firms. Finally, the mixed investment strategies for two firms, the probability that each firm separately exercises the option to invest, and the probability that two firms simultaneously exercise the option are given in the paper.