The cause of snoring is clinically called obstructive apnea hypoventilation syndrome, which can be divided into obstructive, central and mixed. For obstructive cases, most of the obstruction sites are located in the oropharynx, followed by the nasal cavity. For those caused by nasal obstruction, most of them are due to chronic rhinitis and deviated nasal septum, etc. The nasal obstruction is improved, and the snoring caused by the nose will be effectively controlled, while for the central and mixed snoring and foamy mouth, only a ventilator can be worn to effectively solve the snoring.