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.