Abstract: In order to cross fast an outburst coal seam overburdening area of liziya South Second mine 3101 mining face with safety and economically, in this paper ,according to the difficult conditions of average inclination of 48°,soft roof and floor rock, 120m continuous outburst collapse area, we determined to use the way of detection of void area in floor drain and Grout filling. After the implementation of the scene,The results show that the construction scheme not only can successfully go through the outburst coal mining face collapse area, but also has significant economic benefits.