Abstract: Taking roof fall accident in mining roadway of horizontal section caving mining face as the example, it analyzed the reason of roof fall by the methods of numerical simulation and microseismic monitoring. The results showed that multiple mining influence was the main reason of roof fall in mining roadway of horizontal section caving mining face, the coal seam failure depth was 14 to 20 m under mining stress, and the roadway where roof fall occurred located in this range; Along the direction of strike, coal produced weak plane along a certain angle; Support structure existed bedding anchor, weak surface anchor was firstly invalid and it induced support structure invalid, combined effects of multiple factors led to the occurrence of roof fall.