本文运用对称双头垄断时机选择期权博弈模型分析了经营成本对企业研发投资决策的影响。随着研发投资项目经营成本的增加，企业的投资收益下降而投资临界值上升。这使得企业即使面临竞争对手抢先进入的威胁，等待而不是立即投资仍然是最优的。经营成本对于企业的投资收益和投资临界值的影响大于项目投资成本，而且追随者企业对于经营成本更加敏感。 In this paper, we analyze the influence of operating costs on the R&D investment decision with a symmetrical duopoly real option timing game. As the operating costs increasing, the payoffs of firms decrease but investment thresholds increase, so firms prefer waiting to investing even facing the threat of preemption of the rival. We show that the investment thresholds are more sensitive to the change of the operating costs than that of the investment costs, and the operating costs have more influence on the payoffs of follower firm than that of leader firm.