Abstract: Aiming at strong underground pressure behavior and its characteristics in full-mechanized caving mining extremely thick and softly inclined coal seam in Yanbei Colliery of Huating Coal ＆ Power Corporation,this paper applied test method to researching mechanism of dynamic disaster.Comprehensive prevention methods including electromagnetic radiation,micro-seismic monitoring,drilling chip method,blasting relief and water-injecting were adopted to effectively control and decrease behavior of underground pressure.Good prevention effect was obtained.