Abstract: The problems of roadway support have been restricting the deep coal mine’s safe and production. It will put up little deformation, brittle breakage and roof fall abruptly for brittle enclosing rock in some deep mines. On the basis of the situation brittle surrounding rock deformation and destroy, the rock’s triaxial unloading property being researched in this paper. By the experiment results, to investigate the road way’s roof deformation, destroy and mechanics characteristic, so as to provide scientific, reasonable and approving accordings for the supporting design. It concluded that the deformation and destroy of midstable, brittle surrounding rock are due to the unloading imbalance stress in the deep complex, large stress condition road way. The measure to control the deleterious deformation, destroy and indeed roof fall is couple the rigidity, intensity and deformation between the surrounding rock and supporter. And keep road way from cutting, sleek or parting destroy.