A two-level dual-channel supply chain model was established.The performance of forecast information on manufacture and retailer according to Stackelberg game was investigated.The optimal pricing strategies of two cases-information sharing case and non-information sharing case were compared.The impact of forecast information's accuracy and channel competition on retail's information-sharing decision were revealed.The results show that retailers can benefit from the information-sharing within certain conditions,retailers have the motive to share their private information.