Tourniquet pressure how much to see whether it is used in the upper limbs or lower limbs, upper limb tourniquet pressure of 200mmHg, lower limbs in the use of tourniquet pressure does not exceed 250mmHg, if the patient at this time is an elderly person, a child or the body is more special crowd will reduce the pressure by about half. Tourniquet pressure is not the greater the better, not the longer the better, the greater the pressure or longer wear will lead to ischemic necrosis of body tissues, need to pay attention to the observation of the patient’s limbs whether there is a purple and blue, wet and cold, if there is a need to immediately release the tourniquet, and tourniquet can only be used for the limbs, can not be used for other parts of the body.