In the clinic, if the patient has arterial thrombosis in the leg, it will cause the patient to have severe pain in the limb in a short period of time, and some patients will also have ischemic changes in the lower limbs, and serious patients will also have gangrene in the lower limbs. So at this time, it will affect the patient’s life safety, and in serious cases, it can cause people’s death. It should be noted that if the patient has venous thrombosis in the legs, it should not be ignored. Because once the venous thrombus is formed, it will be possible to form a thrombus dislodgement, causing the patient to have a pulmonary infarction. Once the patient has a pulmonary embolism, it is a very dangerous disease, which is mainly manifested as chest tightness, chest pain, sometimes also manifested as dyspnea, hemoptysis and other discomforts. At this time must be given active anticoagulation, thrombolytic treatment, because pulmonary embolism is the most likely to cause patients to die. Therefore, once the patient has a blood clot in the leg, regardless of whether the patient is an arterial thrombosis or a venous thrombosis, must cause enough vigilance, so as to ensure the patient’s life safety.