As recent development of Immunology and Nuclear medicine, serum Ig E and Ig G values are helpful in diagnosis and evaluation of therapeutic effect of nasal allergy. Rhinomanometry was the most reliable method to evaluate the degree of nasal obstruction objectively and was helpful in determining the effectiveness of medical and surgical treatment. In 30 cases that were diagnosed as nasal allergy and treated with hyposensitization in Allergy Clinic of HanYang University Hospital, the author has observed changes in intradermal skin test, provocation test, eosinophil count in nasal secretion, serum Ig E and Ig G values, and rhinomanometry before and after hyposensitization. So the following results were obtained : 1) The size of erythema was markedly decreased over time until 12 months after hyposensitization, thence the change until 30 months was not significant. 2) The eosinophil in nasal secretion was decreased over time after hyposensitization. 3) The provocative reaction was markedly decreased over time until 12 months after hyposensitization and gradually decreased until 18 months, thence the change until 30 months was not significant. 4) The serum Ig E value at 30 months after hyposensitization was 403.2 I.U./ml compared with 428.5 I.U./ml before hyposensitization, 403.7 I.U./ml at 6 months, 409.4 I.U./ml at 12 months, and 390.3 I.U./ml at 18 months after hyposensitization, but the changes was not significant and the continuous follow-up will be considered. 5) The serum Ig G value at 30 months after hyposensitization was 1647.7 mg/dl compared with 1613.0 mg/dl before hyposensitization, 1667.3 mg/dl at 6 months, 1647.2 mg/dl at 12 months, and 1684.6 mg/dl at 18 months after hyposensitization, but the changes was not significant and the continuous follow-up will be considered. 6) The changes in rhinomanometry. (1) The mean total nasal resistance at 6 months after hyposensitization, 0.476 pa/cm³/sec(SD±0.190), was lesser than it before hyposensitization, 0.569 Pa/cm³/sec(SD±0.211). There was statistically significant difference of the mean total nasal resistance(p<0.01). (2) The mean total nasal resistance at 30 months after hyposensitization, 0.384 Pa/cm³/sec(SD±0.121), was lesser than it at 6 months after hyposensitization, 0.476 Pa/cm³/sec(SD±0.190). There was statistically significant difference of the mean total nasal resistance(p<0.01).