Abstract:Concentration leakage is important cause of dam and dyke safety,so leakage intensity,scope and position of leakage passage need to be determined in order to intercept leakage in dyke and dam. In this paper,heat conduction model with homogeneous boundary condition in isotopic soil and heat conduction model including seepage are set up firstly. Then the characteristics of temperature field of those models are presented. Analytic solutions are given and equations are transferred with different variables. The position of the concentrated leakage passage and other parameters are treated as unknown parameters. Optimization target equations are established and different regression methods are referred to. At last,numerical experiments are carried out,and various regressions are done. The result indicates that this detecting method is very effective.