Fibrinolytic enzyme is a protein hydrolase extracted from white-eyed pit viper. It acts on fibrinogen and fibrin in blood to degrade them into small soluble fragments, which can be easily decomposed and cleared in blood circulation. It can promote the release of tissue fibrinogen activator from endothelial cells and enhance its activity to achieve anti-thrombotic function; it can also reduce platelet aggregation and blood viscosity, which has the function of reducing myocardial oxygen consumption and improving microcirculation. It is mainly used for patients with elevated fibrinogen. Patients with elevated fibrinogen found in blood coagulation tests can achieve lower fibrinogen concentration by intravenous infusion of fibrinolytic enzymes. Fibrinogen is degraded into small soluble fragments to reduce fibrin, viscosity and improve blood circulation. Clinically, fibrinolytic enzyme is mainly used in cerebral infarction, hypercoagulable state and thrombotic vasculitis and other diseases.