Abstract: Advanced detection technology was urgently needed because of the frequent happenings of driving working face water inrush,coal and gas outburst accide nt,etc. The reflection seismic method was an important means of geological structure prediction in mining geology advanced detection. The wave field separation and migra tion imaging was the key of reflection seismic advanced detection technology. The conventional kinematics and dynamic wave field separation and migration imaging meth od being contrastively analyzed,the dynamic polarization migration imaging method under the condition of full space had been proposed. The contrast test of advanced det ection in rock gangway showed that polarization migration imaging method had its advantages on eliminating symmetrical abnormal appearance and improving the spatial「 esolution.