Abstract: In order to clarify the occurrence mechanism of floor heave in 15 # coal panel of Yuecheng Coal Mine, and put forward corresponding prevention measures, the cause of floor heave was analyzed combined with theoretical analysis and field situation.It is found that the main causes of serious floor heave of roadway are: large span of roadway, soft and thick mudstone of floor, low structural strength of surrounding rock coal mass and large horizontal stress of roadway.The combined prevention and protection measures of bolt cable+reverse bottom arch beam+grouting reinforcement and sealing floor+roadway-side reinforcement support are put forward.The surrounding rock deformation of the treated roadway is monitored, and the monitoring results show that the floor heave of the roadway decreases obviously after taking joint prevention and control measures.