Objective To study the applications of acoustic rhinometry and rhinomanometry in evaluation of nasal function in obstructive sleep apnea-hypopnea syndrome (OSAHS) patients with abnormal nasal structures treated by nasal cavity ventilation expansion techniques. Methods Thirty-six adult patients suffering from polysomnography (PSG)-confirmed OSAHS combined with nasal obstruction and abnormal nasal structures were included. Endoscopic nasal cavity ventilation expansion techniques were performed individually in all the patients. Before surgery and 6 months after surgery, they all filled visual analogue scale (VAS) and took the examinations of acoustic rhinometry and rhinomanometry．Results Before surgery, the average VAS, total inspiratory resistance (TRi), total expiratory resistance (TRe), minimal cross-sectional area (MCA), nasal volume (NV) and the distance between the nostril and minimal cross-sectional area (DM) were 6.97±1.27,(2.07±1.07)kPa/ L.S^-1,(2.15±1.09)kPa/ L.S^-1,(0.39±0.16)cm²,(2.20±0.97)cm³ and (1.97±0.47) cm, respectively. And those 6 months after surgery were 1.33±0.92,(1.69±1.03)kPa/ L.S ^-1,(1.90±1.02)kPa/ L.S^-1,(0.51±0.17)cm²,(2.73±1.05)cm³ and (2.19±0.46) cm. The differences between pre- and postoperative data of above-mentioned indexes were all statistically significant(P<0.05 or P<0.01). Conclusion Endoscopic nasal cavity ventilation expansion techniques can significantly improve the subjective and objective nasal ventilation functions in OSAHS patients with abnormal nasal structures. Acoustic rhinometry and rhinomanometry may objectively evaluate the changes of nasal function in these patients managed with endoscopic nasal cavity ventilation expansion techniques.