Abstract: A fuzzy comprehensive evaluation model whose membership function is calculated by the normal membership function is established in this thesis according to inadequacy in the traditional safety evaluation and the fact that the state of the whole mining system is changed with the working face advance.The degree of rock-burst can be gained when the weight of the factors are divided into attributive weight and the rank weight followed by the fuzzy matrix operation.This fuzzy comprehensive evaluation model is successfully used in the +500B₁₊₂ and B₃₊₆ working face of WuDong coal with the result that the degree of the rock-burst isⅢ,which is also be verified by ultrasonic CT technology.This good proved method in practice provides a preference to the similar conditions.