TSTstarr + for Treatment of Severe Prolapsed Hemorrhoids --- a Multi-center Randomized Controlled Clinical Trail

Inclusion Criteria: * severe prolapsed hemorrhoids * no significant anal-malformation before operation * having signed the informed consent. Exclusion Criteria: * needing emergency operation or having previous history of hemorrhoids operation * with other anal diseases at the same time such as : anal fissure, anal fistula and perianal abscess and so on * diagnosed with inflammatory bowel disease or proctitis * diagnosed with colorectal cancer * associated with cardiovascular and cerebrovascular diseases and other diseases so that can not tolerate surgery or increase the risk of surgery * with chronic or acute renal insufficiency patients * coagulation abnormalities or with anticoagulation treatment at present * diagnosed with diabetes with poor glycemic control * in women with pregnant or menstruation * The intellectual disabilities or mental disorder * had participated in other clinical trial before we selected 4 weeks * other severe complications.