Dalteparin sodium belongs to a kind of low molecular heparin, are antithrombotic drugs. Dalteparin sodium belongs to a kind of low molecular heparin, in the clinic mainly has the effect of antithrombotic, bleeding risk is small, but also can promote the role of fibrinolysis, the protection of endothelial cells to enhance the role of antithrombotic, the platelet function and lipid metabolism than the ordinary heparin has less impact. It is mainly used in general surgery, hip and knee joint replacement or long-term bedridden malignant tumor deep vein thrombosis prevention. There are two kinds of low molecular heparin, low molecular heparin calcium and low molecular heparin sodium, which can inhibit in vivo and in vitro thrombosis and arterial and venous thrombosis, and is used for thrombosis prevention. So there is no significant difference between dalteparin sodium and low molecular heparin in terms of drug action, but there is a risk of bleeding with the application of this drug. If there is hepatic or renal insufficiency. Or there is a tendency to bleeding, it is not recommended.