At present, minimally invasive saphenous vein endovenous radiofrequency ablation under ultrasound guidance has become the preferred minimally invasive method for the treatment of varicose veins in the lower extremities, and the procedure can be completed under local anesthesia, Blood tests (liver and kidney function, coagulation function, infection screening, blood routine), ultrasound examination of deep and superficial veins of both lower limbs. For patients with particularly serious varicose veins in lower limbs, especially those with suspected deep venous valve insufficiency, in addition to ultrasound, CTV or venography is also needed to determine the degree of valve insufficiency. 2.For patients who have hypertension and diabetes, they may take anti-platelet class or hypoglycemic drugs, because the surgery is completed by local anesthesia, they can eat and drink normally, so they can continue to take them regularly before the surgery without stopping them. Because the endovenous minimally invasive radiofrequency ablation does not strip the main trunk of the saphenous vein, there is basically no bleeding, so patients do not need to worry too much. However, if the patient is taking warfarin medication for atrial fibrillation, it is recommended to stop the medication for about a week. Since the surgery is local anesthesia, there is no need to fast and water before surgery, so you can eat easily digestible food on the day of surgery and do not eat too much; local anesthesia has no effect on cardiopulmonary function, so patients of advanced age and patients with poor cardiopulmonary function but can lie down can undergo radiofrequency ablation. 4.The pain relief effect of local anesthesia is very good, so there is no need to worry about the postoperative pain. 5.Wear loose pants and shoes on the day of surgery to facilitate the wearing of pants and shoes after surgery. 6.The day before the operation, you can shave your legs and groin and take a shower at home, which is good for pasting the film after the operation.