Anti-thrombotic belly shot, is often referred to as low-molecular-weight heparin in clinical practice. Low molecular weight heparin is subdivided into low molecular weight heparin calcium and low molecular weight heparin sodium, depending on the salt it is synthesized from. Due to their different doses, there are now common 4100 IU/stem, as well as 6000 IU/stem. The dosage of the drug needs to be adjusted at the discretion of the patient’s kilogram weight when used. Since the half-life of low molecular weight heparin is 12 hours, it is usually injected subcutaneously at 12-hour intervals when there is no contraindication to its routine use. After subcutaneous injection, the drug is absorbed subcutaneously and has an anticoagulant effect. It is the most commonly used drug in clinical practice to prevent thrombosis or to treat patients who have already had thrombosis or pulmonary embolism. The drug is relatively safe, but the patient still needs to be considered at risk of bleeding during use.