中文摘要：

在正常订单和紧急订单供应商共存情况下,分析制造商的最优订货策略。正常订单供应商采购提前期较长,需在销售期前进行订货。紧急订单供应商交货期较灵活,但交货期长短与成本相关且该成本信息为其私有信息。考虑在此条件下制造商的订货策略（与正常订单供应商）和激励合同设定问题（与紧急订单供应商）。最后,比较了紧急订单供应商的存在与否对制造商的订货以及利润的影响。

英文摘要：

This article analyzes the optimal replenishment decision of the manufacturer with the coexistence of a prime and emergent supplier. Specifically, the manufacturer orders from both the prime and domestic supplier to fulfill the random customer demand. Due to the long production and transportation lead time, the manufacturer makes an order to the prime supplier well before the selling season. For the emergent supplier, his delivery time is controllable and cost-dependent, while the cost structure is the private information. Hence the manufacturer adopts the contract to enforce the domestic supplier to tell his cost information truthfully. Finally. how the existence of the domestic supplier affects the order quantity and profit of the manufacturer is analyzed.