Venous fistula in the clinic have arteriovenous fistula, artificial arteriovenous fistula or penile arteriovenous fistula and so on. 1. Arteriovenous fistula: arteriovenous fistula is the artery and vein tissue defects between the formation of fistula manifestations, may be related to congenital tissue anomalies, this situation needs to be considered in time for surgery to prevent the occurrence of blood supply problems. 2. Artificial arteriovenous fistula for hemodialysis: In hemodialysis treatment, sometimes it is necessary to perform fistula surgery to create arteriovenous fistula to ensure that hemodialysis is carried out effectively. 3. penile venous fistula: penile veins can sometimes have abnormal changes in the fistula, which can affect the normal function of the penis to some extent, and also need timely surgery to repair the local fistula and restore normal blood circulation.