Abstract: The environmental factors was selected as the evaluation object of the safety hazards after analyzing the close relationship between environment and safety hazard.On the basis of extensive literature and field research, environmental factors affecting the safety of mechanized coal working face were established firstly, then applying entropy method to determine the weight of environmental factors. Finally, the quaternary degree of contact was established to evaluate the environmental factors of the mechanized coal working face. It was concluded that the proposed coal working face can be mined with excellent environmental conditions and less safety hazard. Compared with other ways, this method used the basic data of similar working face, avoid the problem that subjective factors affect too much, it provided a new way to evaluate the safety hazard of mechanized coal working face.