Abstract: In order to reveal the coupling characteristics of coal seam gas pressure and mining-induced stress at coalface, the intensive study of coupling characteristics of coal seam gas pressure and the mining- induced stress in working face has been conducted according to the different stresses. The results show that coal mechanical state in working face is fundamental to the difference of coupling gas pressure and mining-induced stress of coal seam. Under the influence of mining，the peak position will assume asynchronous features between gas pressure and mining-induced stress of coal seam in working face and the peak position of gas pressure will present itself before the stress of mining when dilatancy happens；their peak positions will assume synchronous characteristics when the dilatancy doesn’t happen. The research of asynchronous and synchronous characteristics of coupling effect of gas pressure and mining-induced stress in working face provides the scientific evidence to effective prevention an control of the coal and gas dynamic disaster.

Key words: gas pressure；mining-induced stress；&ldquo, asynchronous and synchronous&rdquo, characteristics； dilatancy