Deep vein thrombosis refers to the formation of clots (thrombi) in the lumen of deep vein vessels due to various reasons caused by fibrin, platelets, red blood cells and other components in the blood, making the blood return obstruction and limb swelling, edema, pain, necrosis, and even life-threatening. The main sympathetic clinical features of deep vein thrombosis are rapid onset, swelling of the lower limbs, sharp surge, pressure pain in the femoral triangle, N fossa and calf muscle layer, often accompanied by increased skin temperature and accelerated pulse rate (white swelling of the femur). If the disease magically continues to progress, the limb is extremely swollen, causing compression of the lower limb arteries as well as arterial spasm, resulting in impaired blood supply to the lower limb arteries, the dorsalis pedis artery and posterior tibial artery pulsations disappear, and then blisters often appear on the calf and dorsalis pedis, and the skin temperature decreases significantly daughter and is bruised (femoral bruise), and venous gangrene can occur if not treated in a timely and intense manner. Interventional angiography is the gold standard for confirming the diagnosis of deep vein thrombosis, and once the diagnosis of deep vein thrombosis is confirmed, treatment must be timely, professional and cautious. An inadvertent thrombus in a deep vein can dislodge, and it often leads to pulmonary embolism, which can be fatal.