Abstract:The major influence factors on stope roof stability are rock property condition,environmental condition and engineering factor,which should be considered as possible as you can in the scheme of classification of stope roof stability. Five influence factors,such as uniaxial compressive strength of rock,RQD,compressive strength of coal mass,hydrological condition of roof,and advance velocity of stope,are adoped in the classification. The first three factors belong to rock property condition,the fourth belongs to environmental condition,and the fifth belongs to engineering factor. Five network topology structures,such as 5∶5∶1, 5∶8∶1,5∶11∶1,5∶15∶1,5∶20∶1,are adopted with back-propagation artificial neural network in MATLAB language. Based on the errors of training samples,the topology of 5∶20∶1 is the best one. The stability of roof is classified dynamically with the BP network topology structure of 5∶20∶1,in which there are five input neural units,twenty hidden neural units,and one output neural unit. The influence factors are also analyzed with Parato list. According to the magnitude of influence degree on roof stability,there are RQD (0.438 2),hydrological condition of roof (0.198 8),uniaxial compressive strength of rock (0.147 2),compressive strength of coal mass (0.122 5),and advance velocity of stope (0.093 2).