In 1960, using Lynch's suspesion laryngoscope, Scalco et al. performed the first successful microsurgery in the treatment of polyps and other laryngeal diseases. Thereafter, the introduction of endolaryngeal microsurgery by Kleisasser in 1965 made more useful approach for laryngeal surgery and diagnosis with self retaining laryngoscope. The combined use of the operation microscope and suspension laryngoscope appears to be useful in the evaluation of lesions. Such microsurgical technique has advanced and gained widespread acceptance. From July 1974 to June 1983, authors have experienced 233 cases of various laryngeal lesions in our Dept., Korea University Hospital. And the following results were obtained by Kleisasser's microlaryngoscope and Zeiss operating microscope. 1) Sex distribution was male 1.7 : female 1. Age distribution of male showed a predilection of fourth decade 38 cases (16.3%) and those of female third decade 26 cases (11.6%). 2) Chief complaints were hoarseness in 215 cases (92.3%), sore throat in 47 cases (20.2%), and dyspnea in 35 cases (15.0%) in order. 3) Duration of symptoms were as follows : one to six months in 90 cases (38.6%), six months to one year in 52 cases (22.3%) and over three years in 33 cases (14.2%) in order. 4) Sites of lesion were as follows : both cord in 78 cases (33.5%), Lt. cord in 73 cases (31.3%), Rt. cord in 68 cases (29.1%), supraglottic involvement in 9 cases and whole laryngeal involvement in 2 cases. 5) Distributions of disease in order of frequency were vocal nodule in 82 cases (36.5%), vocal polyp in 57 cases (25.3%), papilloma in 27 cases (12.0%), cancer ( : squamous cell carcinoma) in 30 cases (13.3%), Reinke's edema and others in 6 cases (2.7%), Keratosis and contact granulation in 4 cases (1.8%), and myxoid degeneration, tuberculosis and cyst in 3 cases (1.3%).