Abstract: Transmission lines have characteristics of large span and wide distribution, which greatly increases the survey workload during the pile foundation construction of transmission lines. Based on some known transmission line survey data, we used Kriging, spline function and inverse distance weighting interpolation methods to make reasonable predictions on the main mechanical parameters at other sites of the same line. The interpolation errors of the three interpolation methods were compared in detail, and the main characteristics of different interpolation methods in interpolation of transmission line pile foundation parameters were analyzed. The results showed that the inverse distance weighting method was suitable for interpolating parameters of strip distribution, which had advantages of simple principle, easy programming, and good interpolation accuracy. More over, the influence of power parameters on interpolation of ultimate end resistance of foundations by the inverse distance weighting method was analyzed, and the results showed that the interpolation accuracy gradually improved when the power parameters increased.