Abstract: Aiming at the phenomenon of roof fall in the return roadway of 1-2 coal 5 panel area in Bulianta Mine, according to the method of field measurement, theoretical analysis and numerical simulation, this paper analyzes the causes of the roof fall phenomenon. It is found that the roof of the caving section is flooded for a long time, and the roof is soft in argillaceous sandstone. Therefore, the failure of surrounding rock support of roadway leads to the occurrence of roof collapse. Based on the analysis of roadway roof fall mechanism and the falling shape, the parameters of reinforced anchor cables in the flooding zone of roadway roof are calculated theoretically, and the reasonable roadway reinforcement support design is proposed in combination with the characteristics of plastic failure, and the application of the field is good.