According to the anastomosis of tissues, it can be divided into three types: simple suture, eversion suture and eversion suture. Each type is divided into two types according to whether the sewing is continuous or not: intermittent sewing and continuous sewing. According to the position relationship between suture and tissue, it can be divided into horizontal suture and vertical suture; Sometimes the above situations are combined and named. According to the shape of the seam, it can be divided into purse-string seam, semi-purse-string seam, U-shaped seam, 8-shaped seam, T-shaped seam and Y-shaped seam. There are also special-purpose sutures, such as tension-reducing suture, intradermal suture, suture hemostasis and so on.