Leg thrombosis caused by cesarean delivery is usually deep vein thrombosis of the lower extremities. Deep vein thrombosis in the lower extremities, depending on the location, is divided into deep vein thrombosis in the lower leg, femoral vein thrombosis, popliteal vein thrombosis and iliac vein thrombosis, and iliac-femoral vein thrombosis is called the central type of vein thrombosis. The symptoms of deep vein thrombosis in the calf are relatively mild, with swelling, pain, sunken edema in the calf, positive gastrocnemius grip pain, and the thrombus is easily dislodged in the acute stage, causing the risk of pulmonary embolism. In case of central venous thrombosis, the symptoms are more acute and severe, with painful swelling of the whole limb, high skin tension, and some severe patients will have skin flushing, elevated skin temperature, and sensorimotor dysfunction. At this time, surgical operation to remove the embolism or interventional treatment is needed to release the venous embolism, otherwise it will cause serious adverse consequences such as amputation.