This paper puts forward the innovative development model of water-saving service industry of “water-saving management contract plus water right trading”, on the basis of introducing the connotation, profit model, promotion situation and existing problems of water-saving management contract. The authors constructs the transaction mechanism of water-saving under contracts from the aspects of transaction mode, transaction subject, transaction object, transaction term, transaction method, transaction pricing, transaction process, transaction performance, income distribution and risk management, the aim is to provide a feasible scheme for further optimizing the water-saving service industry chain and promoting innovative development of water-saving service industry, better solve the application of water-saving management contracting in the field of agricultural water-saving, meanwhile, to increase project revenue for other water-saving management contracting projects with stable water saved, and promote the joint development of water-saving management contract and water rights trading.