Abstract: Failure modes of rock mass isdetermined by the rock mass structureswhich influence the characteristics of the rock mass. Based on the observations for rock burst in Qirehataerdivisiontunnel, this paper proposes a concept of rock-burst burst-body which is used to describe thecritical state of failure for textured rock mass. Rock-burst burst-body isinitiated, evolved and controlled by the micro structuresof rock mass, the geostress features and the engineering layout, et al.Moreover, the forming process, failure modes and the mechanisms of rock-burst burst-body are exploredby studying the features of rock burst in different place of Qirehataer diversion tunnel. The concept and study of rock-burst burst-bodypresented in this paper will be helpful to further study of rock burst.