The shock environment of shipboard equipments in shock resistance tests is usually characterized by the shock response spectrum calculated with acceleration signals.The original acceleration signal usually contains the trend error, which leads to the severe distortion of low frequency band of the shock response spectrum.Based on the numerical equivalent relationship between the shock response spectrum and the Fourier transform amplitude spectrum, a method combining the fast Fourier transform and low-frequency oscillator for correcting shock signals was proposed, and a shock testing machine was used to verify the method.The research results show that the application of the correction method can improve the slope of the low-frequency band of a shock response spectrum from -3.245 dB/oct to 5.631 6 dB/oct, meanwhile, it has minimal impact on the high-frequency band of the spectrum.The correction method can reflect the impact environment of shipborne equipments in the shock test more accurately, which is of great significance to guide the verification of the shock resistance of shipborne equipments.