Abstract: Ecological water conservancy engineering is currently the focus of the work in water research,but also the goal and direction of future water resources and hydropower development.In this paper,taking the ecological harnessing project in Beixia reach of Conghua Longtan river as an example,the hydraulic calculation methods and the calculation process involved in the riverbed and the beach strand ecological harnessing engineering are analyzed and studied.Two problems in this project including maintaining the p...