A seismometer acquisition has been used at the Changping Observing Station to gather the output of strainmeter． The original rate of the strainmeter of once per minute changed to 100 times per second for seismometer acquisition sampling． Plenty of higher frequency data are recorded and the minutely data calculated from seismometer acquisition are consistent with the original data sampled by strain acquisition． And more completed waveform are recorded through higher sampling． The seismic phase parameters calculated by strain earthquake waves of higher sampling rate are also consistent with predecessors． Spectrum of the strain earthquake waves are compared with seismic waves recorded by a seismometer at the Shisanling Seismic Station，and their trends are almost the same． Some lower frequency ingredients exist in strain waves．