中文摘要：

考虑到市场需求不仅受零售商库存量的影响,而且常依赖于零售商的延期支付策略,研究了易腐商品需求同时依赖于库存量与延期支付期限的两级延期支付库存策略问题。刻画了零售商平均利润最大化模型,分析了零售商利润函数的函数性质,并给出了最优性条件。利用数值算例,对关键参数进行了灵敏度分析,算例表明：1消费者需求敏感于零售商库存量时,零售商增加商品订购量易刺激市场需求,零售商利润增加;2零售商扩大延期支付期限时,刺激了市场需求,收益增加,但同时利息成本增加,最终导致零售商利润先增后减。

英文摘要：

Considering the market demand is not only affected by the retailer＇s stock level,but also relies on the credit strategy of retailer,we study the inventory strategy for two-stage trade credit where the demand of perishable commodity rely on both the stock level and the two-period trade credit.We construct the retailer＇s average profit maximization model,and analyze the properties of retailer＇s average profit maximization function,and present the optimality condition.Through numerical examples,the sensitivity analysis of key parameters is given.The study shows that：（1）while the consumers＇ demand is sensitive to the retailer＇s stock level,the retailer increases the order quantity of commodity to stimulate market demand,and the retailer＇s profit increases;（2）while the retailer expands the credit period,the market demand is stimulated,and the retailer＇s profit increases,but the interest cost increases simultaneously,and eventually leads to the retailer＇s profit increases first and then decreases.