In order to explore the impact of recycling scale and remanufacturing extended warranty services on the decisions of recycling channel in closed-loop supply chain,based on the model that manufacturers provide extended warranty services and retailers sell extended warranty services,considering the scale of recycling to promote remanufacturing extended warranty services,the Stackelberg game method is adopted to establish a centralized decision model and two extended warranty service sales decentralized decision models in which manufacturers and retailers are respectively responsible for recycling.The results show that the recycling scale has a certain limiting effect on different recycling channels;the centralized decision model has the highest profit,and the manufacturer and the retailer have the highest profit when the retailer is responsible for recycling in the decentralized decision model.And the impact of recycling scale on different model decisions is analyzed,and it is pointed out that the expansion of recycling scale will have a positive impact when centralized decision-making and the retailer is responsible for recycling work;the expansion of recycling scale can have a negative impact when manufacturers are responsible for recycling work.