Combined with -850 level Shimen construction experience in Qianjiaying Mine, grouting artificial roof roadway technology was adopted to deal with coal and gas outburst coal seam super large roof falling area, advanced pre-grouting, Multi-layer spray grouting anchor net combined with metal arch support were adopted to control roof effectively and solve the roof falling problem of preventing roof falling accident in mining, with significant guide to support plan in coal and gas outburst construction.