In this paper, the receiving wave types and speed parameters of GPR were discussed, the interference information was determined, and the examples of utility poles, overhead lines, mountains and other interference objects were analyzed. According to the differences in arrival time and propagation velocity, filtering processing of the interference was made by means of deconvolution, F-K  filtering and shifting. The results show that the multiple wave interference, curved interference and horizontal interference can be effectively filtered, thus highlighting the effective wave. It is proved that this method is feasible and effective.