According to the game of dual channel supply chain consisting of a single manufacturer and a single remanufacturer, considering the impact of carbon emission reduction on the remanufacture product demand, channel preference coefficient and the substitution coefficient of product are introduced, the dual channel supply chain decision models under different contract mechanisms are developed, and how the manufacturer encourages remanufacturers to improve the level of emission reduction through effective coordination mechanism is analyzed. The research results show that the improved cost sharing revenue sharing contract can encourage the remanufacturer to achieve the emission reduction level of centralized decision-making, and the change range of the coordination coefficient under the improved contract mechanism is also affected by the substitution coefficient of cross demand and the consumer's awareness of carbon emission reduction level.