Varicose veins in the lower extremities are common clinical diseases, and the traditional treatment is saphenous vein ligation and stripping, which is very traumatic, with much blood loss during surgery and slow recovery after surgery, and leaves obvious scars, which seriously affects the aesthetics. How to treat varicose veins of lower extremities in a minimally invasive, effective and aesthetic way is a hot spot and difficult point of clinical research at present. From March 2008 to February 2009, our hospital adopted endovenous radiofrequency ablation closure combined with electrocoagulation to treat varicose veins of lower limbs, and the recent efficacy is satisfactory, which is reported as follows. 1.Clinical data and methods (1) Case selection criteria primary lower limb saphenous varicose vein (2) Case exclusion criteria ① main trunk of saphenous vein diameter greater than 10mm; ② branch varicose vein with thrombophlebitis mass; ③ branch varicose vein with obvious varicose mass not suitable for electrocoagulation; ④ varicose vein with unhealed ulcer. 2.Surgical method The saphenous vein trunk is closed by endovenous radiofrequency ablation: the saphenous vein path is marked before the operation, and the saphenofemoral vein union (the junction of saphenous vein and femoral vein) is located by ultrasound during the operation. Epidural anesthesia is used, and after satisfactory anesthesia, blood is driven to make the blood from the superficial venous network of the lower limbs flow into the deep veins. Using the method of percutaneous puncture, the vascular sheath was placed into the distal saphenous vein, and swelling solution (saline) was injected subcutaneously along the course of the saphenous vein to prevent skin burns, and the treatment electrode was placed through the vascular sheath, and the electrode head end was sent to 5 mm below the saphenofemoral vein junction under ultrasound positioning, and the electrode head was opened for radiofrequency ablation; heparin saline (500 ml of saline with heparin 6000 IU ) drip through the radiofrequency ablation catheter to prevent the formation of thrombus at the electrode head during radiofrequency ablation; the temperature control during radiofrequency ablation treatment is 85℃±3℃, the resistance is 150Ω-200Ω (8Fr electrode catheter, resistance ≥200Ω; 6Fr electrode catheter, resistance ≥150Ω), retract the electrode at the speed of 3cm/min, the temperature will drop sharply when encountering the venous branch or traffic branch. At this time, the electrode should be left for 5s~10s to wait for the temperature to rise to 85℃ before continuing to withdraw the catheter, and the assistant should press the closed vein at the same time, when the electrode is withdrawn to the vascular sheath, the resistance will rise, turn off the host, and the RF ablation is finished. The superficial varicose veins are treated with electrocoagulation needle electrocoagulation: after the blood is removed from the vein, the electrode is introduced with 18G cannula needle, and the marked veins (mostly in the calf) are treated with electrocoagulation index 25-30 respectively, followed by compression bandage for the affected limb. 3.Postoperative treatment Postoperative intravenous application of antibiotics to prevent infection, low-molecular heparin calcium (100U/Kg) subcutaneous injection of the abdominal wall once / d, a total of 3-5 d, 6 hours after surgery, the patient walked on the ground, elastic bandage compression bandage 3-5 d after the change to wear sequential decompression elastic stockings, 3-5 d after surgery, discharged from the hospital, oral medicine to improve venous function for 1 month, wearing elastic stockings for 6-9 months.