The aim of ear operation is to ceases otorrhea and to restore hearing. The ceasation of otorrhea and the graft of tympanic membrance are reached to successful stage, and yet hearing restoration process still remains further to need a matter of development. Author carried out 67 cases hearing restoration operation among 154 patients who had been undertaken mastoid-tympanoplasty during period of Feb. 1978 through March 1979. 54 cases have been followed for this study among 67 cases hearing restoration operation. The used material of operation are almostly incus and some cases with TORP. This paper is dealing with its surgical method and postoperative audiometric study.