The results are proved that the optimal retailer order quantity under the wholesale price contract maybe less than that of the centralized supply chain and that the supplier can coordinate the decentralized supply chain by the markdown allowance contract. 证明了批发价格契约下损失规避型零售商的最优订货量总和可能小于集中化供应链的最优订货量,供应商可通过价格补贴契约实现供应链协调。