Abstract:With the development of society and the increasing level of spiritual civilization, the function of urban waterways is no longer limited to flood control and waterlogging drainage. The attention of the people is more focused on the construction of the water ecological environment nearby. In order to improve the water environment quality of Xitucheng Gully in Beijing, to build the high-quality water environment of "clear water, smooth river, green bank and beautiful scenery" for the citizens, and based on the data of water environment characteristics, rainfall situation during the flood season and upstream water inflow of Xitucheng Gully in 2021, the statistical methods are used to sort out and analyze the data. The results indicate that the impact of rainfall runoff during the flood season on the water environment of Xitucheng Gully is relatively severe. Through the case analysis, some suggestions are proposed to improve the water environment of Xitucheng Gully. The water flow regulation is adopted to accelerate the replacement of polluted water bodies. The biological agents are delivered and the physical measures are taken to cope with the sudden sewage into river. The water environment improvement facilities are increased in river channels to improve the water quality. The targeted measures will be taken according to the actual situation, which provide more ideas for the water environment treatment of Xitucheng Gully and the high-quality development of urban rivers and lakes.