Lower extremity tourniquets should be placed on the skin proximal to the bleeding wound and not too far from the wound as possible. In clinical practice, it is often seen that some patients use towels, wires, ropes, etc. to tie the hemostasis for too long, which can cause undesirable consequences such as ischemic necrosis at the end of the limb. The correct method should be wound with a tourniquet or rubber tube and other tension bands on the skin proximal to the wound, with a towel or gauze separating the tourniquet or rubber tube from the skin to protect the skin from damage. To strictly control the tightness of the ligature, too loose can not stop the bleeding effect, too tight easily cause ischemic necrosis of the lower limbs. After ligating the tourniquet to mark the hemostasis time should relax the tourniquet every 30 minutes for 2-3 minutes. Tourniquet should not be used for a long time, not more than 4 hours, not only to make the hemostatic play a hemostatic effect, full hemostasis, but also to ensure the blood supply of the distal limb, to protect the wounded follow-up treatment.