This paper focuses on the ultra-high frequency (UHF) components during high-shock measurement. The UHF signal cause zero-drift, non-linearity or damage to accelerometer. How the UHF power affects to the accelerometer is discussed in this paper. Mechanical filters are proved to be useful to separate the UHF with the others. According to the analysis and experiment results, solutions are put forward to the zero-drift problem of piezoelectric accelerometer.