讨论了随机需求环境下完全向下替代的两代易逝品订货策略,对模型的最优条件和性质进行了证明,结论表明:零售商提供替代性的产品可以获得更高的期望利润,被替代产品的订货量与价格折扣成反比,替代产品的订货量与价格折扣成正比,零售商的期望利润则与价格折扣成正比. The ordering strategies for the two generations of perishable goods that are completely displaced downward in the stochastic demand environment are discussed. The optimal conditions and properties of the model are proved. The conclusions show that retailers can provide higher expected profits by providing alternative products. The order quantity of the substitute product is inversely proportional to the price discount. The order quantity of the substitute product is proportional to the price discount, and the retailer’s expected profit is proportional to the price discount.