Adenoid hypertrophy or concomitant tonsillar hypertrophy in children can cause obstructive sleep apnea hypoventilation syndrome. The symptoms of this disorder are sleep snoring with breath-holding (i.e., apnea) and open-mouth breathing. The prevalence of obstructive sleep apnea syndrome in children is about 0.7%-3% on average 2%, mainly occurring at the age of 2-6 years. Apnea and hypoxia can affect the growth and development of children to varying degrees, such as causing abnormalities in breathing, development, neurocognition, and even sudden death in children in severe cases. Indications for adenoid surgery 1. frequent snoring, sleep breath-holding, poor breathing; 2. frequent colds, with rhinitis and sinusitis not easy to get better; 3. with secretory otitis media, adenoids compressing the eustachian tube, or adenoids themselves have inflammation, otitis media not easy to heal.