In this paper, we study a green product dual-channel supply chain with a manufacturer and a retailer. The service free-riding is considered, and the channel price difference is also introduced as a strategic tool to adjust the channel conflict. In centralized and decentralized models, we give the optimal decisions of the supply chain members and analyse the effects of the service free-riding and the price difference on the related decisions. In order to coordinate the dual-channel green supply chain, we also design a two-part tariff contract coordination model, which allows both the manufacturer and the retailer to obtain a win–win result. From the analytical and numerical results, we find that the proper service free-riding degree and price difference are beneficial to the decision makers and the greening of supply chain. And in the centralized model, when the degree of service free-riding is small, the increase of the channel price difference can stimulate the manufacturer to provide the lower price product with lower service and green degree, otherwise, it is the opposite. Besides, the result also shows that, except for consumers, the centralized model always performs better than the decentralized model in the profit and social welfare aspects.

在本文中，我们研究了一个由制造商和零售商组成的绿色产品双渠道供应链。考虑到服务搭便车，同时引入渠道差价作为调整渠道冲突的战略工具。在集中式和分散式模型中，我们给出了供应链成员的最优决策，并分析了服务搭便车和价格差异对相关决策的影响。为了协调双渠道绿色供应链，我们还设计了两部分关税合同协调模型，使制造商和零售商都能获得双赢的结果。从分析和数值结果看，适当的服务搭便车程度和价格差异有利于决策者和供应链的绿色化。而在集中式模式下，当服务搭便车程度较小时，渠道差价的增加会刺激制造商提供服务和绿色程度较低的低价产品，反之则相反。此外，结果还表明，除消费者外，中心化模式在利润和社会福利方面始终优于去中心化模式。