Typical symptoms and signs: The typical symptoms of PTS are swelling and swelling of the limb, pain, heaviness and easy fatigue, which are obvious when standing and can often be relieved after lying down. Due to the obstruction of venous return, it leads to malnutrition of the local tissues of the limbs, which is manifested by skin pigmentation, dry and thickened skin, subcutaneous fibrous tissue hyperplasia, and easy to develop skin infection of the limbs. Disease progression can also cause venous claudication and ulcers, which seriously affects the quality of life and even loss of work ability. Morbidity: The incidence of PTS is high after DVT, with 25% to 50% still occurring after regular anticoagulation therapy alone, and about 10% of these patients will develop venous ulcers. Treatment: The existing treatment modalities for PTS are mainly conservative and endoluminal treatment, while surgical treatment is gradually decreasing due to its poor efficacy and trauma. Traditional conservative treatment includes medical compression stockings, airwave compression therapy and intravenous active drugs. Among them, compression therapy, especially medical compression stockings, is still the basis of PTS treatment. One study showed that DVT patients who wore medical compression stockings for more than two years had a lower incidence and severity of PTS than those who did not wear compression stockings. Some venous active drugs, such as horse chestnut seed extract and rutin and flavonoids, are commonly used to reduce the symptoms of PTS and chronic venous insufficiency, and their efficacy has been demonstrated in clinical studies. Interventional endoluminal treatment of PTS: Recanalization of veins after DVT is often incomplete, with residual thrombus mechanization and the thrombus itself stimulating thickening of the vein wall, and narrowing of the venous lumen is one of the important pathogenic mechanisms of PTS. With advances in vascular interventional techniques, treatment of diseased vessels and opening of narrowed or even occluded veins by endoluminal means have become important tools for effective relief of chronic venous hypertension after DVT and treatment of PTS. These treatments help to resolve venous outflow tract obstruction, restore venous blood flow, improve calf vein pump function, improve PTS symptoms, promote healing of venous ulcers, and improve patients’ quality of life. The current opening of the iliac and inferior vena cava veins and venous stenting are not only more effective and have an immediate effect on limb swelling, but also have a higher long-term patency rate. Several clinical studies have shown that the first- and second-stage patency rates after iliac vein opening and stenting are 6l%-78% and 80%-95%, which is similar to our experience in clinical work in recent years.