Thrombosis is a plaque caused by hypercoagulation of one’s own blood. There are red thrombi and white thrombi in this kind of thrombus, and no matter which kind of thrombus is formed, it is difficult to dissolve once it is formed. So far, there is no special thrombolytic drug that has a clear thrombolytic effect and can completely remove the thrombus in the body. For acutely formed thrombus, thrombolytic drugs such as urokinase, alteplase and tenecteplase can be applied, which can dissolve the thrombus, but the application needs to be limited in time. At the same time, there are strict indications and contraindications for their application, and their application cannot guarantee the complete dissolution of acute thrombus, and their effect on old thrombus is even weaker, and there is a risk of bleeding after application, so they should be used with caution. Once formed, the thrombus is stable and not easy to dissolve, and it leads to narrowing of blood vessels, which can block the blood vessels completely in serious cases. Therefore, we should usually pay attention to the risk of thrombosis to avoid serious consequences.