Electric shock is usually electric shock by hand and foot touching the ground (special circumstances). When a high-voltage electric shock occurs, the current is quickly conducted to the circuit in the form of the body and from the hand to the lower limbs. There are more vascular electrolytes in human body, and the current is more obvious, followed by skin, fat and bone. This process generally does not cause obvious trauma to the internal organs of the chest and abdomen (unless the voltage is too high and there is no obvious loop), because the current always travels in the direction of large potential drop. In this way, the current always flows through the arms and lower limbs of the electrocuted person and travels along the muscle tissue rich in arteriovenous blood under the great blood vessels of the limbs. The heat generated by electric current will burn muscles and skin in a large area, destroy arteriovenous vessels, affect blood circulation and form secondary ischemic necrosis, so amputation is needed.