Abstract: Due to uniqueness of talus slope's spatial variations,the fitting error of the spherical model variation function is bigger using the weighted polynomial regression,sometimes it is impossible to fit variation function.In order to solve this problem,the genetic algorithm is applied to fit the spherical model variational function,because the genetic algorithm is a robust method for search for the optimum solution to the complex problems.The application of genetic algorithm fully exert its advantage on seeking priorities,furthermore,the data of the accumulation body with high slope on the left bank in Front of Xiaowan hydro plant Dam is employed to calculate and test as an example.By comparing and analyzing the dates on the example from different angles,it demonstrates that the new method is convenient,universal and precise.It is an excellent method for estimating parameter of non-liner,incontinuity or differentiable model parameter.