Upper extremity replantation is relatively less commonly performed than finger or hand replantation. We have experienced one case of forearm replantation and one case of upper arm replantation. After the replantation, limb volume at the biceps brachii muscle level below the replantation level appeared to be appropriate, however, the motor function of the muscles and the sensitivity were disappointing. For replantation of forearm and upper arm, restoration of the motor function and sensitivity of the extremity below the amputation level as well as the morphologic reconstruction have to be considered.