Abstract: On the basis of analyzing the causes of a large number of coal mine accidents caused by mine group, we demonstrate the importance of the group taken as the first line of defense in the coal mine safety production in the coal mine hidden danger investigation and management process; we further improve the classification of hidden dangers including the responsibility of the group, establish hidden danger investigation process of the group; we introduce mainly the application scheme of hidden danger investigation of coal mine group, including the data transmission scheme, the hand-held terminal system and the application effect. The study indicates that bring the group into hidden danger investigation process is critical to encourage group to participate in the safety services, improve their safety awareness, move the focus of hidden danger investigation forward and ensure coal mine safety production.