Surgical knots are very widely used and are used during surgery in the abdominal cavity and at the skin where the incision is sutured. Knot tying is divided into one-handed tying and two-handed tying. One-handed knots are generally more commonly used in the abdominal cavity because the space in the abdominal cavity is relatively small, and if two-handed knots are tied, two hands may not be able to get down, because only one hand can go down. According to the person’s usual hand, if the usual hand is the right hand, it is the left hand to lift the line without moving, and then the right hand to tie the knot. There are two types of knots: hook-hand knotting and pressure-hand knotting, depending on the habits of each person. If the tension of the knot is high on the skin or somewhere in the abdominal cavity, you can use both hands to tie the knot if it is easy to loosen with one hand. Tying knots with both hands means lifting the thread with both hands at the same time and tying the knots with both hands to each other, the combination tied at this time will be more secure.