To get endogenous timing in a supply chain, a promotion-pricing game model was established in a supply chain with two manufacturers and one retailer. The effects of product substitutability and promotional efficiency on promotion-pricing strategies and endogenous timing were analyzed. The effect of cost difference on member decision and endogenous timing was explored through numerical simulations. It is found that the level of supply chain coordination is improved due to an increase in promotional efficiency of famous brand. Overall endogenous timing cannot be changed by cost difference, and only regional area gets influenced. If the action timing of participants in the game is arbitrarily assumed by a researcher, wrong conclusions may be obtained by him.%在两个制造商和单个零售商组成的供应链中,为了得到供应链内生时机,构建了促销-定价博弈模型,分析产品替代度和促销效率对促销-定价策略和内生时机的影响,并通过数值仿真探讨成本差异对成员决策和内生时机的影响.研究表明:强势品牌促销效率的增加将提高供应链的协调水平；成本差异不改变整体内生时机,只对区域范围产生一定影响,如果研究者随意假设博弈参与人的行动时机,那么所得结论可能是错误的.
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