Abstract: Through the seismic monitoring system, abundant microseismic signals are collected during the period of rock burst in Yuejin Coal Mine, Qianqiu Coal Mine and Changcun Coal Mine of Yimei mining area. The time-domain waveform and spectrum characteristics of microseismic signals are analyzed by the fast fourier transformation (FFT).The results show that when the rock burst occurs, the main seismic amplitude is large, and the duration of high amplitude is short in Yuejin Coal Mine, the waveform duration is greater than 0.2 s; the duration of high amplitude is greater than 0.3 s in Qianqiu Coal Mine, the waveform duration is greater than 0.2 s; the duration of high amplitude is from 0.5 s to 1.0 s in Changcun Coal Mine, the coda wave duration is greater than 0.2 s. The low-frequency proportion is big, the frequency band is wide. The frequency of Yuejin Coal Mine mainly concentrates in the range from 0 Hz to 80 Hz, the high energy waveform frequency is from 0 Hz to 40 Hz; the frequency of Qianqiu Coal Mine concentrates from 0 Hz to 240 Hz, the high energy waveform frequency is from 0 Hz to 80 Hz; the frequency of Changcun Coal Mine mainly concentrates from 0 Hz to 100 Hz, the high energy wave frequency is from 0 Hz to 40 Hz.