Abstract: In order to advance the identifying power of the buried objects and improve the estimate precision of the ground penetrating radar(GPR) data instantaneous attributes.The instantaneous attributes estimator of analytic signal is composed of the differentiator and integrator based on FIR filters having maximally flat frequency response.They first are applied to study the instantaneous attributes in GPR data and compare with the center difference method(CFDM).The results find that the resolving power is advanced using the instantaneous frequency estimator of filter(FIFM)in GRP data.It is proved that the FIFM method is very valid to deal with the GPR data and can be applied identifying the position and shape of the buried objects.