Enoxaparin sodium is a low molecular weight heparin preparation, clinically known as low molecular weight heparin. It has a strong antithrombotic effect and a certain role in dissolving thrombus. Enoxaparin sodium, generally 1mg/kg, subcutaneous injection, 12 h 1 time. When the loading dose is given, intravenous injection may be given. For the elderly and kidney failure patients, pay attention to appropriate reduction. Clinically, it is mainly used for the prevention of venous thrombosis after surgery, the prevention of deep vein thrombosis, the treatment of pulmonary embolism, deep vein thrombosis and acute coronary syndrome. The most common complication of enoxaparin sodium is hemorrhage.