The process of venous thrombosis is mainly caused by endothelial damage, blood flow blockage, hypercoagulable state and other factors, which can be treated by drugs and surgery. 1. Vascular endothelial damage: the human body in some stock trauma, surgical process, may cause vascular endothelial damage, the formation of the phenomenon of the inner wall of the blood vessel is not smooth, may induce the coagulation mechanism, resulting in venous thrombosis. 2. Blood flow stasis: the human body may cause blood flow stasis in the case of prolonged braking, for example, patients with bone fracture are bedridden for a long time, and some occupations require prolonged standing, and this part of the patients may also have venous thrombosis. 3. Hypercoagulable state: Some patients suffering from rheumatic immune diseases, malignant tumors and other diseases may also have venous thrombosis due to hypercoagulable state of the body. Patients can be treated with anticoagulant drugs such as warfarin, and at the same time, they can take drugs such as Diosmin to promote venous blood return, the specific choice of drugs should be given by the doctor according to the actual condition of the patient’s body to give scientific advice.