Groundwater is closely related to human production and life.Groundwater environmental assessment is a very important part of hydropower project.Taking a pumped storage power station as an example,the hydrogeological model of the study area was established by GMS(Groundwater Modeling System)numerical software to simulate the groundwater seepage state of the hydropower station under natural conditions,and to predict the groundwater system during the construction and operation of the project.On this basis,according to the characteristics of the construction and operation period of the project,the measures and countermeasures of groundwater environmental protection are put forward,so as to provide reference and suggestions for similar projects.