Abstract: On the basis of establishing numerical model，the numerical analysis software，such as Ansys and Flac3D，were applied to optimize the parameters of stage height，ore block length，width and pillar width，combined with the lithologic conditions and filling body strength requirements of super large iron ore in Anshan Area. By comparison and analysis，the reasonable mining structure parameters were chosen to obtain the best mining effect，which provides scientific basis for the scheme determination of cemented filling mining in extra large underground mine.

Key words: Super large underground Mine, Cemented filling, Structure parameters optimizing, Backfilling