Abstract: In the plan model of demandforecast update conditions,asymmetry information and double marginalization are still key problems influencing the relationship between the supplier and retailer.Based on the newsboy model and Bayesian analysis,supply chain system in demand forecast update conditions with asymmetry is described in order to analyze the asymmetry information and double marginalization.Then,the minimal order proportion contract based on the incentive principle of agent theory is designed to incent the retailer to share private information so that asymmetry information can be reduced,and compensating contract is designed to solve the problem of low efficiency of double marginalization.Finally,based on the operational data of supply chain constituted by Baijia company andfaw-volkswagen company,the parameters of the two contracts are calculated so that the validity of the two contracts can be verified further.

Key words: supply chain coordination, asymmetry information, demand fo recast, minimal order proportion contract, compensating contract