由于供应商供应的不可靠性,会产生一些不合格产品,而这些不合格品又会影响到买方对产品的销售。本文考虑到由于瑕疵品引起的供应不确定对买方订货选择的影响。检查找到瑕疵品后,买方可以选择是否使用后备供应。通过比较买方的订货决策和期望利润,我们找到了影响启用后备供应的相关量。最后,我们运用实际算例印证了影响买方使用后备供应的量主要包括:瑕疵品的返回折扣率;未售出合格品的剩余价值;瑕疵率的概率分布;瑕疵率方差。 Due to the unreliability of suppliers, there will be some unqualified products, which in turn will affect the buyer’s sales of the products. This article takes into account the uncertainty of supply due to defective products on the buyer’s order selection. Check to find defective products, the buyer can choose whether to use the backup supply. By comparing the buyer’s order decision and expected profit, we found a correlation that affected the opening of backup supply. Finally, we use the actual examples to confirm the impact of the buyer to use the reserve supply mainly include: the discount rate of return of defective products; the unsold surplus value of defective products; probability distribution of defect rate; flaw rate variance.