Thumb reconstruction with a free neurovasculsr wrap around flap from the great toe by microsurgery had been first reported by O'Brien, Macleod and Morrison in 1980. We have performed one case of thumb reconstruction with psrtial first metstarsus for loss of thumb except pulp and one digital vessel by microsurgery. The results were summerized as followings ; 1. This one stage procedure has the unique advantage to reconstruct a thumb almost identical to the origin. 2. This technique allows preservstion of the toe and the secondary defect results in no significant morbidity.