The location of the tourniquet is divided into the upper limb, lower limb, and the end of the limbs, as follows: 1. Upper limb: generally the upper arm is tied to the upper middle section; 2. Lower limb: generally the upper middle section of the thigh is tied, these two places only the humerus or femur, and there is no other bone block, so in this place tied tourniquet, can make the whole limb blood flow blocked, so as to achieve the effect of distal hemostasis; 3. End of the limbs If it is a finger or a toe, generally when tying a tourniquet to tie the root of the finger or toe, it can block the blood flow, but it is not recommended to tie a tourniquet on the forearm or calf, because this place usually has two bones, and the important blood vessels are in the middle of the two bones through the place, so tying a tourniquet can not achieve the effect of stopping bleeding. The use of tourniquet must control the pressure and time, otherwise it will cause necrosis of the limb.