Snoring is the sound made by soft tissue fluttering when the airflow passes through the narrowed passage due to the narrowing of the upper airway. If the narrowing is so severe that it causes airway obstruction and hypoventilation or respiratory arrest (i.e. breath-holding), it is potentially life-threatening and requires prompt medical attention, which is called “obstructive sleep apnea hypopnea syndrome (OSAHS)”. It is called “obstructive sleep apnea hypopnea syndrome (OSAHS)”. Snoring is often found to be closely related to nasal diseases such as deviated septum and nasal polyps, pharyngeal diseases such as tonsil and adenoid hypertrophy, uvula hypertrophy, soft palate and tongue hypertrophy, endocrine diseases, small jaw deformity, obesity and muscle relaxation in old age. Severe snoring can cause headache, daytime sleepiness, drowsiness, inattention, even abnormal mood and behavior change, and even can lead to hypertension, heart disease, callousness, cerebral ischemia or bleeding, dementia, proteinuria, loss of libido and other diseases, and extreme cases of sudden death at night also happen from time to time. In addition to routine nasal, pharyngeal and laryngeal examinations, nasopharyngeal endoscopy and imaging examinations are also essential items for snoring patients. Polysomnography (PSG) can clarify the type and severity of sleep apnea hypoventilation syndrome through EEG, EMG, oral and nasal airflow, chest and abdominal movements, oxygen saturation and other indicators for about 7 hours throughout the night, which provides an important basis for the selection of treatment plan.