Since 1988, with the aid of the microsurgical technique, circle invagination suture method was adopted to carry out primary repair of injury of the flexor tendon of hand in 30 cases, 54 fingers. The rehabilitative exercises were carried out early after operation. The patients were followed up postoperatively more than 6 months. According to the grading method of TAM for evaluation of the results, the excellentfair rate was 83.3%. This suture method and its advantages were introduced. The importance of atraumatic technique in operation and early ehabilitative excercises in order to prevent tendon adhesion were emphasized .