中文摘要：

针对单一产品具备电子渠道和零售渠道，只有一个供应商和一个零售商的供应链模型，顾客任意选择适合自己的购物渠道，一旦所偏好的购物渠道缺货，一部分顾客会转向另一渠道购买产品．供应商和零售商分别采用（Q，R）和一对一策略补充资源．利用马尔可夫过程建立供应链收益模型，针对供应链的产品可获得性进行研究．结果表明：缺货替代率可能提高也可能降低分散控制型供应链效率；集中控制型供应链可以针对不同的缺货替代率适时调整基准库存水平，从基于缺货被替代的供应链中受益，而分散控制型供应链中供应商和零售商的基准库存水平对顾客的缺货替代率反应不敏感，更容易导致双方利益受损．

英文摘要：

The paper focus on the supply chain model with a single product in electronic and retail channel, only a supplier and a retailer in system, customers have alternatives to choose the channel that is better suited to their needs, some of them may alternatively switch to the other channel to buy product when a stock-out occurs in their preferred channel. Supplier and retailer implement （Q, R） and one-for- one ordering policies respectively to replenish their inventories. We set up the profit model of supply chain by Markov process, and study to the product availability of supply chain. The result shows that the stock-out based substitution rate may increase or decrease the efficiency of a decentralized supply chain. the centralized supply chain can adjust the based-stock levels timely to different stock-out based subsitu- tion rate and benefit from it, the supplier and retailer are in a decentralized supply chain more inattentive to customers＇ stock-out based substitution rate, and prone to lose their benefits.