Abstract: According to the lake ecological restoration theory and engineering practice cases, the construction technology of macrophytes-dominated clear water ecosystem of a new artificial lake was proposed. Through the habitat optimization and the construction of aquatic animals, aquatic plants and microbial systems, as well as regular observation, debugging and maintenance management, a macrophytes-dominated clear water ecosystem was formed with submerged plants as the core, which had strong resistance and self-recovery capabilities. Taking an artificial lake in the northwest as an example, the proposed method was used to construct a water ecosystem. After one year of operation, the main water quality indexes (except TN) reached Class Ⅲ water quality standard of Environmental Quality Standards for Surface Water (GB 3838-2002). In the lake, 5 submersed aquatic plants were widely distributed, such as Potamogeton lucens Linn and Hydrilla verticillata, and had a good reduction effect on pollutants. And a stable macrophytes-dominated clear water ecosystem was realized.