Through the investigations of blot-shotcreting supporting works of roadways in a certain mine in Hunan, it is found out that the blasting earthquake, supporting timeliness and quality, surface evenness of excavated roadway, mixture ratio of concrete , etc., are the significant things causing the burst ,breaking and caving of shotcrete layer in bolt-shotcreting supported roadway. Based on the stress distribution in surrounding rock and the supporting performance of bolt-shotcreting, this paper puts forward some measures to prevent the failure of shotcrete layer.