Polidocanol submucous sclerosis in the part of pharynges with 1% polidocanol injection.The injection should be in the retropharyngeal submucosa and lateral pharyngeal bands and lateral pharyngeal submucosa and in front submucosa of soft palate.The injection is multi-point,and each point injection is 0.3~0.5ml;the total quantity/each time is not more than 5ml.Every patient have to be treated about 1~2 time.