In the normal human body, there is a dynamic balance of blood clotting and blood dissolution. If blood clotting is enhanced, the body becomes susceptible to thrombotic or embolic disorders, often requiring the administration of anticoagulant therapy. Clinically used anticoagulant drugs include: aspirin, which is the most commonly used anticoagulant drug, it reduces the aggregation of platelets by inhibiting the role of arachidonic acid; second, Bolivar, which is a powerful drug against platelet aggregation, it can inhibit the role of ADP, thereby reducing the aggregation of platelets, often used in postoperative anticoagulation treatment of heart valves or other diseases; third, heparin anticoagulant drugs. This is a conventional anticoagulant drugs, there are two categories of high molecular weight heparin as well as low molecular weight heparin; Fourth, warfarin, this is an oral anticoagulant drugs, due to inhibit the absorption of vitamin K, reduce the activity of coagulation factors associated with vitamin K, so as to play an anticoagulant effect.