The underground complex geological structure exerts great influence on fully mechanized working face advancing, in order to make working face cross the fault with geological structure change, avoid roof caving and realize safe and efficient mining, Liuhe Mining Industry was taken as example, the 2503 fully mechanized working face was detected in advance by radio wave penetration technology, it was found that the distribution of the fall of fault bigger than 1/2 coal seam and long axis of collapse coal column bigger than 20 m were explored, provided scientific data for mining and support of working face.