Blood transfusion is clinically used for intravenous drip, generally a course of treatment is about 7-10 days, the specific time to be judged by a professional doctor according to the patient’s specific condition. The main ingredient of blood transfusion is leech, which is a traditional Chinese medicine product in China, and it is mainly used for clinical cerebral infarction and peripheral vascular atherosclerosis occlusion, and also reported in the literature to be used in the treatment of lower extremity deep vein thrombosis. As the main function of blood-sparing is anticoagulation, vasodilatation, and activating blood circulation and removing blood stasis, and it also has the function of antiplatelet, so in the process of intravenous drip must be closely whether there are petechiae, hemorrhagic spots, tooth bleeding, nose bleeding, black stools, etc., if there are the above manifestations, it is necessary to stop the drug in time and give the symptomatic treatment. At the same time, some patients may have allergic reactions in the early stage of drip, such as skin itching, dyspnea, etc. Allergy should be stopped immediately to avoid serious consequences. Of course, there are also a few patients who show cardiovascular and cerebrovascular abnormalities, such as panic, palpitation, etc. If some adverse reactions occur, the infusion should be stopped immediately. In daily life, patients are advised to have a low-salt, low-fat diet, quit smoking and limit alcohol, exercise moderately, and keep a good mood. Be sure to manage blood pressure, blood sugar, blood lipids, and weight.”