The important point in vascular anastomosis is anastomosis with a secure suture and prevention of thrombosis. Uncertainty in sutures can cause bleeding from the anastomotic site and post operative pseudoaneurysm formation. In addition, the failure of the antithrombotic function causes early occlusion of the anastomotic site due to thrombus formation, causing intimal thickening and causing stenosis of the anastomotic site. Vascular anastomosis must be performed with attention to the property and site of the blood vessel, the method of graft formation, and the procedure of suturing. Training is required for fast and accurate sutures, and it is also important to conduct off the job training to efficiently improve your proficiency.