In supply chain decision,the decentralized decision is used more than the centralized one,and a Stackelberg game is played between the supplier and the retailer,in which the supplier is often the leader,while the retailer is the follower.In this paper,we consider that the supplier maximizes his own profit by designing an advisable contract,while the retailer increases his profit by increasing his sales volume with effort.This paper establishes a one-stage supply chain model based on buy back pol...