The primary role of snake venom hemagglutinase is to stop bleeding, mainly for bleeding and oozing from wounds after surgery and can be used to prevent bleeding prior to surgery. If it is used to prevent bleeding before surgery, one unit of snake venom hemagglutinin should be administered intramuscularly the night before surgery. In the case of bleeding and oozing of blood from the wound after surgery, the application of snake venom hemagglutinase can be intramuscular or intravenous, requiring one unit of intramuscular injection as well as one unit of intravenous push every eight hours. It is also important to observe the flow and color of the drainage tube during the treatment. If the flow is very high and the color of the drainage is bright red, it means that the intra-abdominal bleeding is very high and very fast. In this case, the patient’s heart rate will be accelerated and blood pressure will be lowered, so it is not possible to rely on hemagglutinin alone to stop the bleeding, and if necessary, the patient should be resuscitated in the operating room.