Abstract: Through systematical analysis of fully mechanized caving mining technology in Tangyang Coal Mine seams under complex geological conditions, the roof fall and changing surfaces in working face are the main technical problems that fully mechanized caving mining face faces. Based on the analysis of fully mechanized caving face, the paper proposes major technical approaches and measures to deal with the changing surfaces of the face and roof fall. In Tangyang Coal Mine complicated geological conditions, the succuss practice is implemented to achieve breakthrough for mechanized caving mining technology, and gets good the expected effect.