基于二层信用策略的EPQ模型中,绝大多数的模型是考虑单物品的情形,由于需求的多样性,多物品库存模型越来越受库存管理者的关注.在二层信用条件下,假设零售商仅提供给它的顾客部分货款延期支付,建立了部分延期支付的多物品EPQ模型,并证明了模型存在唯一的最优解,最后给出数值例子验证模型的有效性. In the EPQ model based on Tier-2 credit strategy, the majority of models are single-item cases, and due to the diversity of demands, the multi-item inventory model is more and more concerned by inventory managers.In the second-tier credit conditions, The retailer only provides partial repayment of the payment to its customers, and establishes a partially deferred payment multi-item EPQ model and proves that the model has the only optimal solution. Finally, numerical examples are given to validate the validity of the model.