A tourniquet for the thigh is usually to be located proximal to the wound and then as close to the wound as possible, with its standard site being at the junction of the middle and lower 1/3 of the thigh. Forearms and lower legs are usually not suitable for tourniquet ligation, because forearms and lower legs are two long bones side by side, its bone gap can be passed through the blood flow, so the hemostatic effect is not good, longer local tissue ischemia, necrosis, so the ligation should be relaxed tourniquet once every half an hour to one hour. Relaxation can be rubbed, massage to relieve local limb ischemia, ligation again after 1-2 minutes of loosening, of course, do not repeat in the same part of the bundle, can be up and down to do a slight adjustment. When tying a tourniquet, you should also stretch the rubber tube appropriately, around the limb 2-3 circles and then fixed, with the elasticity of the rubber retraction compression of arteries and veins, the ligature should not be too tight or too loose, in order to disappear the arterial pulsation of the distal end as appropriate. In addition, the use of tourniquet should not exceed 4 hours.