It is researched in the paper whether the simplest three-stage supply chain by revenue sharing con-tract can coordinate a response to unconventional emergency.The revenue sharing contract model of three-stage supply chain is established under the unconventional emergencies,taking the severe change of the demand distribu-tion function,and the retail price which is endogenous variables and changes linearly according to the supply and demand relationship as essential characteristics.The model is analyzed and verified by some examples.The result indicates the three-stage supply chain cannot coordinate to deal with unconventional disruptions by the benchmark revenue sharing contract when the market scale changes largely.If the members of supply chain can share addition-al cost of production or treatment according to a proportion by negotiation,then three-stage supply chain can coordi-nate a response to unconventional emergencies by revenue sharing contract.%研究最简单的三级供应链在收益共享契约下是否能协调应对非常规突发事件。将需求分布函数发生剧烈变化、零售价格作内生变量并随供求关系呈线性变化，作为非常规突发事件的本质特征，建立相应的三级供应链的收益共享契约模型，对模型各种情况进行了分析，并通过算例进行了验证。研究结果表明：非常规突发事件引起市场规模发生剧烈变化，基准收益共享契约不能够协调供应链；若供应链上的成员通过谈判确定一个恰当的比例分摊额外增加的生产成本或处理费用，调整后的收益共享契约下能协调供应链。
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