First, what is called sleep apnea hypoventilation syndrome 1, sleep apnea syndrome refers to sleep with severe snoring, paroxysmal apnea, and sleep 7 hours pause more than 30 times, each pause of more than 10 seconds, or apnea index (i.e., the number of pauses in breathing per hour) is greater than 5, and accompanied by a reduction in oxygen saturation of a syndrome. 2. It is often categorized into central type, obstructive type and mixed type. Central type refers to the central lesions caused by the person; obstructive type refers to the upper respiratory tract lesions, the most common is the soft palate, uvula, tonsils and tongue root lesions; mixed type is both. Second, the diagnosis of obstructive sleep apnea hypoventilation syndrome 1, where obese people, sleep snoring, that should be thought of the possibility of this disease. 2.Pharyngeal examination of the uvula, soft palate hypertrophy and relaxation, tonsillar hypertrophy, proliferative hypertrophy, pharyngeal cavity narrow, it increases the possibility of this disease. 3, ask their family members or sleep in the same room, if there is snoring and apnea during sleep, basically can be diagnosed. 4. In children, proliferative hypertrophy is often an important cause, which may affect intellectual development. 5, in order to clarify the relevant indicators should be carried out the following tests: (1) polysomnography: can specify the amount of oral and nasal respiration, thoracic and abdominal respiration, as well as electrocardiography, heart rate and blood oxygen saturation. Where every 7 hours of sleep, apnea more than 30 times, each time more than 10 seconds, and apnea index is greater than 5 can be diagnosed. (2) Electroencephalography, electrooculography, and electromyography. (3) Fiberoptic laryngoscopy and CT examination of the pharynx can clarify the site and degree of obstruction. Surgical methods for treating obstructive sleep apnea and hypoventilation syndrome Surgical treatment should in principle take appropriate measures to relieve obstruction: (1) Nasal stenosis: nasal septum correction, nasal polypectomy, or partial resection of hypertrophic turbinate should be performed as appropriate. (2) Pharyngeal stenosis: perform mastoidectomy, tonsillectomy, palatopharyngoplasty and so on. (3) Hypertrophy of lingual tonsils: laser carbonization, partial excision of lingual root. (4) Small jaw deformity: perform small jaw deformity correction surgery. (5) Tracheotomy, etc.