In order to improve the cable fault location ability of the traditional low voltage impulse method, the low voltage impulse method based on short -time cross -correlation is proposed to locate the cable fault. Firstly, the low voltage impulse test is carried out on the cable to get the corresponding test waveform. Then, the short -time reference signal is obtained according to the input signal waveform, and the cross -correlation coefficients of time -shifted short -time reference signal between the test waveform are calculated. Finally, the cable fault is located according to the peak position of sequence curve of the absolute cross -correlation coefficients. The simulation and measurement results show that the proposed method can effectively improve the recognition ability of the reflected information and the location ability of cable fault.