The occurrence and development of microsurgical technique is one of the most wonderful medical achievements in the twentieth century. By assistance of optic system, it has successfully made surgery from macroscopic field into microcosmic world and evidently broadened the applied scope of surgical technique. The microsurgical technique has also made surgery more accurate. Now it has been used most widely in the reparative and reconstructive surgery and almost leaves nothing to be desired in small vascular anastomosis. Microsurgery has greatly extended the scope and depth of the reparative and reconstructive surgery and made many accurate operations which were never proceeded to come true before. Many new subjects therefore have been formed for this reason.