The TST procedure, also known as selective suprahemorrhoidal mucosal anastomosis, is regarded as the safest minimally invasive technique in the anorectal treatment industry so far. The TST minimally invasive procedure makes use of a special anoscope to form different open-loop windows, uses an anastomosis probe to lock the hemorrhoid nucleus and adjusts the resection range of the hemorrhoid mucosa according to the size and amount of the nucleus, which maximally protects the normal function of the anus. The main advantages are: 1. Precise positioning: Using the special anoscope, the prolapsed mucosa can be precisely positioned and the mucosa on the prolapsed part of the hemorrhoid can be successfully and safely removed selectively, which is in line with the theory of anal cushion downward movement and reduces the surgical trauma. 2.Light pain: Traditional surgery is performed in the anal cushion area controlled by the somatic nerves, which is sensitive to cutting and has severe pain; TST surgery is performed in the rectal mucosa area controlled by the vegetative nerves, which is not sensitive to cutting, so the surgical pain is mild. 3, high safety: TST technology treatment will not leave scars, will not destroy the physiological function of the anal cushion, will not destroy the normal structure and appearance of the rectum and anal canal, and also avoid complications such as anal stenosis and incontinence. 4. Short recovery time: Due to the smaller treatment trauma, patients recover faster after surgery, and most patients can basically recover and start normal work and life in 3-5 days after surgery.