The urban artificial lake is an integral part of the urban eco-system, which provides the city with sustainable development conditions. Ecological restoration projects combined with the improvment of water quality and water eco-system should be used for management, including environmental dredging, arti cial wetlands, plant landscape engineering, etc. Therefore, reasonable and scienti c construction technology can effectively ensure the quality of the project. Based on this, combined with the actual situation of an arti cial lake in Hangzhou, the critical construction technologies for ecological restoration are analyzed in detail to provide a reference for similar projects.