Aiming at the anti-seepage design for the fishway structure arranged on the slag pile platform，we study the anti-seepage forms for various hydraulic structures in water conservancy project. Based on the comparative analysis of the anti-seepage form of similar projects，we conclude that the anti-seepage material suitable for this project is the anti-seepage geo-membrane，the excellent elasticity and deformability of which make it very suitable for the expansion or contraction base，and which can effectively overcome the uneven settlement of the base surface. It is also has the advantages of good seepage prevention effect，convenient construction，lower project costand shorter project period. Summarizing technical characteristics and construction precautions of geo-membrane，we hope to provide reference for similar projects.