Abstract：The major reason that roadway or working face in coal mine is destroyed by rockburst is that the rockburst tremor generated by shock wave propagates and disturbs the coal-rock materials in the limit stress state. Microseismic(MS) technology can monitor and forecast rockburst by revealing indirectly energy release in deformation and fracture and frequency-spectrum characters of the coal-rock materials. To distinguish the danger classes of rockburst，the research on precursory information is a key question. By the TDS–6 MS test system，the MS signal of the compound coal-rock samples obtained from Sanhejian coal mine is studied in the processes of deformation，fracture and rockburst. It is found that the low-frequency components in precursory MS signals in the later period of cyclic loading will increase，the frequency-spectrum will move to low frequency band，and the amplitude is lower. But the high-frequency components in mainshock signals induced by rockburst will increase and the amplitude will increase suddenly to the maximum value. By monitoring the rockburst catastrophe on spot，the low frequency components in precursory MS signals will increase，and the amplitude will also begin to increase gradually. When rockburst happens，the amplitude of the mainshock signal suddenly increases to the maximum value，the high-frequency components will obviously increase compared to precursory signals. Based on the results，it can be believed as precursory information of rockburst that the frequency-spectrum of MS signals starts to move towards low frequency and the amplitude will also begin to increase. The conclusion will generate considerable important directive significance for monitoring and forecasting rockburst catastrophe with MS monitoring system in coal mines.
