In order to establish the principles of reconstruction surgery after the partial lary ngectomy, the correlation between post-operative function and shape of the remnant larynx was analysed from a acoustical or aerodynamical viewpoint and the following conslusion was obtained. 1) For the vertical partial laryngectomy, convex smooth surface of operated side is necessary to obtain good phonation. 2) For the supraglottic horizontal laryngectomy , supraglottal orifice and shortening of the

more »

... tic fold increase the hoarseness or inhibit the laryngeal vibration . On the other hand, the descendence of the larynx, especially of the aryepiglottic fold provoke mal deglutition. To obtain good post-operative function , therefore, these obstacles must be resolved. Finally, some procedure based upon the above-mentionned principle for the reconstruction surgery was proposed.