The author performed research on the perfection and improvement of intellegent monitoring devic for rock accoustic emission.In light of the theory of grey control system,systematically analyzed and estimated the accoustic emission parameters for evaluating rock mass stability and the method for determining the critical value of rock roof collapse;and set up predicting model to probe into the sequence prediction of rock-roof collapse and large scale disaster in mine.It was proved in practice that the above method and the adopted measures are feasible.