Many water conservancy and hydropower projects are located in karst areas of which complicated structure would cause significant risks to water conservancy and hydropower projects, so identifying the presence or absence of pipeline leaks is one of important basic conditions for water conservancy and hydropower project. Determining the existence of leakage channels has important applications tracer diffusion of water tracer experiment, this paper is the experimental investigation of tracer leakage passage of a hydropower station in West China, determining the existence of leakage passage can be worked through experimental investigation on part of the left abutment of the hydropower predict leakage passage to.