The mucous membrane is crinkled and the anal cushion is lifted after ligation. 2.Direct ligation of the base of the hemorrhoid block can stop the bleeding 3.Directly block the blood supply of the hemorrhoid, so that the hemorrhoid block occurs necrosis and falls off. COOK hemorrhoid gun minimally invasive concept COOK hemorrhoid gun technology: is currently the most efficient international lancing technology, using natural rubber lancing ring, with 0.1MPa pressure uninterrupted attraction of the lesion, resulting in the attraction site tissue necrosis, and then fall off. This technique does not require any incision and has good orientation, short treatment time, less bleeding, safety and reliability, and can be called minimally invasive surgery. A large number of domestic and foreign clinical papers and data show that ligation can effectively solve the problem of internal hemorrhoids with little risk and low complications. Currently, 90% of the ligation treatment techniques used in Europe and the United States are derived from the COOK hemorrhoid gun ligation technique, which is now rapidly gaining popularity in China as well, guaranteeing the best treatment results. Self-ligating ligation under negative pressure – economical and effective. In the process of applying the negative pressure lancing gun, we found that after the first ligation was completed, the second and third internal hemorrhoid ligations were prone to slippage or even dislodgement of the rubber ring, so we used the negative pressure hemorrhoid grab to ligate up to two places at a time. Therefore we designed and invented the self-locking knot internal hemorrhoid ligation under negative pressure attraction, after getting inspired by the laparoscopic appendiceal ligature, and a kind of tying method of fish hook, using the improved negative pressure ligature and homemade knot pushers, pushing the knot firmly, which can be performed in 3-5 places, applying No. 7 mousse thread, economically. Indications for internal hemorrhoid ligation 1.1st and 2nd degree internal hemorrhoids, bleeding internal hemorrhoids. 2.It can be combined with other surgical methods for the treatment of complex hemorrhoids, multiple hemorrhoids. If one part is externally peeled and ligated, other lighter internal hemorrhoids can be ligated, which can significantly reduce the occurrence of anal stenosis. 3.It can be used as the treatment of recurrence after other surgeries.