中文摘要：

对有确定需求、有初始库存和库存短缺的一种畅销商品，建立了供应商管理库存的供应链模型。然后，分别分析分散式、集中式和VMI三种供应链模式下的库存补充数量最优解及各方收益情况，得到VMI的实施将可能造成供应商收益下降。再运用委托-代理理论分别讨论了信息对称和信息不对称时的VMI数量折扣契约设计问题。最后，给出算例说明了，此协调策略有助于VMI的实施。

英文摘要：

For a kind of salable goods, supply chain model of vendor management inventory（VMI）is established, on the basis of definite demand and a ready source of initial stock, but in short supply now. Then, this paper firstly deduces the optimum inventory replenishment quantities and profit function of each member under three supply chain contracts：non-coordination,integrated control,and VMI,and the implementation of VMI is proved that the profit of vendor may decrease.After that, VMI quantity discounts contract under symmetric and asymmetric information is designed by principal- agent theory. Finally, a numeric exapmple illustrates this coordination strategy is conductive in the implementation of VMI.