Microvascular anastomosis is too important to reduce the failure in operating room because of no choice in case of failure and prognosis of the failure would be more worse than any other success ones. Factors for microsurgery trainee influencing patency in microvascular anastomosis at the laboratory are numerous but three basic prerequisites are magnification, instruments and suture material and training. First Author trained microsurgical technique to the second author using femoral artery of the rat and patency of the anastomosis was evaluated by the milking test. Period which microsurgeon successes femoral arterial anastomosis in rat in both of 5 and 30 minutes was 7th week at the laboratory which has done 2 vessels a week under the supervise of the skilled first author.