Wind power has been developed rapidly in recent years. With a lot of wind power farms were built and put into operation, the importance for wind power equipment manufacturers to construct aftermarket and develop aftermarket services becomes more and more obvious. In this paper, the motivations for wind power equipment manufacturers to develop aftermarket services were analyzed. Wind power equipment aftermarket’s connotation and service types, like logistics services, technical services, financial services, training services, information and knowledge services, were studied. A service mode of wind power equipment aftermarket based on wind power industry service alliance is put forward. Three strategies for wind turbine manufacturers to improve aftermarket service capability are proposed.