For patients with venous thrombosis, it is recommended to take oral anticoagulants for about 3-6 months. It is recommended to increase the duration of oral anticoagulants moderately, because deep vein thrombosis tends to recur when the duration of oral administration is relatively short. Rivaroxaban can be given to patients with venous thrombosis for about 3~6 months, and at the same time, regular color ultrasound of lower limb veins can be performed to observe the situation of thrombus. When taking rivaroxaban orally, observe whether there is bleeding, which is the most common adverse reaction, and observe whether there is gastrointestinal bleeding or bleeding of skin mucosa. Note that patients who are allergic to this drug should not take it, and patients with obvious active bleeding or coagulation abnormalities should not take this kind of drug. Clinically, for patients with lower extremity deep vein thrombosis, consult the vascular surgery department of regular hospitals for diagnosis and treatment.