Objective To explore the efect of adenoidectomy by endoscopy in treating obstructive apnea hypopnea syndrome(OSAHS) in infants.Methods 16 cases of OSAHS in infants were treated by adenoidectomy.All were diagnosed as adenoidal hypertrophy by X-ray.Operation was done under general anesthesia by endotracheal intubation.Results Snoring and nasal obstruction disappeared.No recurrence was found in a follow-up of 6 to 12 months.Conclusion Adenoidectomy by endoscopy is effective in infants with OSAHS.