The duration of treatment for pulmonary embolism is at least 3 months of anticoagulation therapy. After the selection of anticoagulant drugs, the patient will choose different anticoagulant drugs and the process will monitor the patient’s coagulation or new anticoagulant drugs are not required to monitor, but the overall treatment will be at least 3 months. 3 months later, the patient will be evaluated and if the high risk factors have been removed and the pulmonary embolism has improved, the anticoagulation therapy can be ended. If the patient’s persistent high-risk factors cannot be removed, the duration of anticoagulation therapy for pulmonary embolism will also be prolonged, and the duration will vary greatly from patient to patient on an individual basis. For special cases, such as pulmonary embolism combined with lower extremity venous embolism such patients will opt for lower extremity venous filters, some of which can be removed and some of which are implanted for a long time. Such patients will require lifelong anticoagulation, or will have longer anticoagulation times in patients with tumors. However, for patients with no risk factors but independent pulmonary embolism, most of them are cured in about 3 months.