Lower extremity deep vein thrombosis is a common and frequent disease that jeopardizes the general public, and it is very easy to become chronic, which not only affects the swelling of the affected limb and severely affects the activities, but also leads to ulceration of the affected limb, infection and other serious consequences. Conventional medication or surgical procedures such as femoral vein cross diversion not only have a narrow scope of application, but are often ineffective. There are many triggers for lower extremity DVT: prolonged bed-ridden illness, post-surgical braking, sedentary lifestyle, pregnancy, trauma, long-term use of contraceptives, and tumor …… The clinical manifestations of DVT include swelling, pain, superficial skin varicose veins, and limitation of end limb movement. With the further development of the disease, generalized swelling of the lower limbs may occur, skin blisters appear, and even necrosis of the limbs may occur. Therefore, attention should be paid to the above-mentioned high-risk groups. It is also important to note that deep vein thrombus may be dislodged, such as dislodged into the pulmonary artery, can cause pulmonary embolism. Large pulmonary embolism can be fatal. Treatment can be divided into two categories: non-surgical treatment and surgical treatment. Surgical methods are 1, the use of Fogarty catheter, suitable for patients not more than 48 hours after the formation of thrombus, has the advantages of good efficacy, quick results, and few postoperative complications. 2.Inferior vena cava filter implantation. Non-surgical treatment mainly relies on drugs for anticoagulation, deconcentration and thrombolytic treatment. Because of the above characteristics of DVT, patients with sudden lower limb swelling, pain and superficial vein dilatation should go to regular hospitals for treatment as early as possible in order to maximize their recovery.