Abstract: In the context of a low-carbon economy, in order to achieve supply chain coordination under different cooperation mechanisms, a three-level supply chain composed of suppliers, manufacturers, and retailers is used as the research object, and the game theory method is used to find that the game subject under the Nash equilibrium emission reduction strategy in the three mechanisms of non-cooperation, cost sharing and coordination and cooperation. The equilibrium results and optimal profit values under these three mechanisms are compared. The results show that under the cooperative mechanism, each game player has a higher degree of emission reduction efforts, and the cooperative decision-making of product emission reduction and profit optimal value is also superior to non-cooperative and cost-sharing mechanisms.