Abstract: Based on engineering practice in 8101 working face of Selian first coal mine, caving forms of loose roof and rib falling forms of coal wall has been obtained by the field measurement, and the action mechanism of roof caving and rip falling has been analyzed, and loose roof plastic zone before and after rip falling of coal wall has been analyzed by numerical simulation, also about stress and roof convergence, and controlling principle and measures of loose roof caving and rip falling of coal wall has been proposed for field applications. Several conclusions were obtained: Firstly, empty-support distance of working face increased cause by rip falling of coal wall and abutment pressure increasing also extending to the deep of coal body, and that speed up caving of the loose roof. Secondly, the most empty-support distance of roof caving [a]≤1.64m has been obtained by theoretical analysis. Lastly, rip falling of coal wall compared with before it, there is tensile failure of roof in empty-support distance, limit-equilibrium realm of coal body and roof above hydraulic support decreased, roof vertical stress increased significantly after rip falling of coal wall and the maximum increase roof convergence is 0.5m. When rip of coal wall fall, it all increase about vertical stress, shear stress and roof convergence, and it falling more easily.