The tourniquet should not be tied for more than 1 hour each time, and it is best to loosen the tourniquet every 40-50 minutes, for about 2-3 minutes each time, and use acupressure to stop bleeding during the loosening of the tourniquet. If a tourniquet is not loosened for a long time, it may cause peripheral blood circulation disorders, resulting in limb necrosis and other adverse consequences. When tying a tourniquet, be careful to mark the time and site, and loosen the tourniquet once every 40-50 minutes or so. The site of the tourniquet also has requirements, the upper limb generally choose the upper 1/3, in the site of the tourniquet should be padded with cotton pads, etc., can not be directly compressed to the skin, to avoid direct pressure and skin compression necrosis caused by adverse consequences. The tourniquet can not be continuous for more than 3 hours, if the treatment effect is not good, you can consider surgery and other methods to stop bleeding.