Abstract: A novel design method of surface acoustic wave(SAW) bandpass filter is discussed.After resampling at the interval of M,the original desired weighting function is decomposed into two weighting functions with less order by the zero separating of Z-transform,and then represented by interpolation derived from the signal reconstruction theory and can be furtherly suboptimized using the standard Remez change method.The simulation results of a Blackman spectrum-shaping filter with the center frequency of 70 MHz,the roll-off factor of 0.19,0.35 dB ripple,67 dB rejection,confirm that this method is very simple and effective.