The precautions for amputation surgery are as follows: First, the incision for amputation must be fish-mouth shaped, so as to make the distal end of the limb oval after suture, and to avoid skin damage due to the irregularity of the distal end of the limb in the future. Secondly, after the bone is amputated, the proximal end of the bone must be leveled with a file to prevent the fracture end from easily piercing the soft tissues in the future, resulting in pain. Third, the length of the muscle tissue at the end of the limb should be just long enough to encompass the bone. Fourth, before cutting the blood vessel, the proximal end of the blood vessel must be given a ligature, which must be ligated with two separate wires to prevent hemorrhage due to accidental detachment of one wire.