A electrical safety in the operating room is one of important responsibility for the anesthesiologists and surgeons. When the patient is included in an electric circuit with poor ground during operation under the general anesthesia electrical accident might be occurred, such as sustained muscular contration with asphixia, impairment of CNS function, ventricular fibrillation, and more commonly, burn and other physiological injuries. Authors report an electrical burn on the right calf area (3X5 cm) and both heels by ground plate of electrosurgical unit which is probably poor contacts with the patient and review about its prevention and safety of electric practice.