Abstract: Considering two scenarios of complete outsourcing and manufacturing outsourcing, game models of centralized decision-making and decentralized decision-making are established to obtain the corresponding optimal decision of each member in the green supply chain dominated by the brand merchant. The results indicate that, in the scenario of complete outsourcing and manufacturing outsourcing, the level of carbon emission reduction is higher in centralized decision-making than in decentralized decision-making; and that no matter what decision-making method is adopted, the complete outsourcing situation can achieve higher level of carbon emission reduction. Through a numerical analysis, the influence of carbon emission reduction cost coefficient and carbon rebate coefficient on the optimal order quantity, total carbon emissions and supply chain profit are discussed.