Objectives: Compare the nervous plexus anethesia with Bupivacain using nervous sonde machine and normal anethesia (without using machine) in extremitas superior operation: sese less effect, catastrophe,complicate disaster. Promoting suitably using technique. Methods: An advanced study, clinical trial experiment, random assortment, comparision with over 164 patients, age from 16 to 65, ASA I, II, has been indicated upper leg operation. Patients have been desensitized the nervous plexus anethesia with Bupivacain at upper handspike arm, 2mg/kg dose and Adrenalin 1/200000 mixed with adequate purified water 40 ml and divided into 2 groups (n = 82): Group I: Using nervous excitation machine to desensitize, group II: using normal needles to desensitize. Evaluating the effect of restricted feeling, movement, side effects and comparision between two groups. Results: To meet the seselessness of operation: good rate at group I (73,17 percent) which has been higher than group II (60,97 percent), which has statistics meaning (p 0,05). However, the blocking rate of extremitas superior nervous has been low (group I: 8,54 percent, group II: 4,88 percent), which is not totally suitable for collar-bone and shoulder operation. Group II has happened more catastrophe, side effect than group 1. Conclusions: Nervous plexus anesthesia at upper handspike arm with Bupivacain has given highly senseless effect in extremitas superior operation (one third from middle arm bone to palm). The group that has used the nervous excitation machine to desensitize has given more' sese less quality, less catastrophe and side effect than group using normal needles to desensitize.