24 SUGGESTIONS Supraclavicular brachial plexus block under ultrasound guidance using dexmedetomidine adding to bupivacaine with only injection one time, the technique which is simple, onset time of anesthesia is quickly. It improves intraoperative anesthetic efficiency for upper extremity bone surgery, prolongs duration time of postoperative analgesia with low VAS score in the first 24 hour at after blockage.