Obstructive sleep apnea hypopnea syndrome (OSAHS) affects the patients' quality of life, and can cause cardiovascular and cerebrovascular complications. Accurate assessment of the severity of the disease can help to judge its prognosis. Polysomnography (PSG) is the gold standard for the diagnosis of OSAHS, but its main parameters, respiratory disturbance index and minimum oxygen saturation, can not accurately reflect the severity of the disease and are often separated from the subjective sensory severity of the patient. However, some somnolence scales and quality of life scales are related to the subjective factors of patients with poor objectivity and reproducibility. The current clinical evaluation methods and parameters all have some disadvantages, so it is necessary to develop a comprehensive evaluation method from multiple perspectives.