Abstract: The security question of the colliery is more and more a focus that people pay close attention to, it has already been the task of top priority to solve the safe problem. Study the cause of the problem of safety of coal mines, it is the key to solving the problem. Safe rheology and the sudden change theory, Morfil's law have solved the cause of the safe problem. Strengthen and warn the function safely, it is the guarantee of realizing the safety in production of the colliery to improve the safety management.