If the blood loss casualty wound location on the body surface, and the wound is large, more bleeding, the surrounding people in the call 120 emergency phone, you can first put the patient in the head low foot high position, while using compression to stop bleeding, not clear specific hemostatic techniques, according to the doctor’s guidance steps to operate. 1, stop bleeding: in general, the wound is small direct finger pressure, when the wound is larger Can use the palm of the hand or gauze stuffing, etc. for pressure to stop bleeding; if the wound has arterial bleeding of the extremities, consider using a tourniquet, bandage or clothing, etc. for ligature to stop bleeding, and record the ligature time; 2, oxygen: heart, brain ischemia and hypoxia is an important cause of death and sequelae of blood loss casualties, there is obvious shortness of breath or slow breathing patients, should also be early artificial respiration, oxygen, and If possible, timely rehydration and blood transfusion should be carried out, and the specific site of bleeding should be clarified by corresponding examination, so that surgical intervention can be carried out as soon as possible; 3, monitoring of vital signs: while hemostasis and oxygenation are carried out, the patient’s pupils, breathing, blood pressure and other vital signs should be monitored if possible; patients with thoracic and abdominal injuries should be checked for organ damage to avoid irreversible internal bleeding. In addition, if the casualty has a significant drop in blood pressure, give symptomatic treatment with epinephrine, or dopamine. If cardiac arrhythmias and other signs of cardiac decompensation are present, early treatment with cardiac stimulants should also be administered.