1.Laser treatment method Conventional epidural anesthesia, in order to prevent accidentally entering the femoral vein, ligate the saphenous vein at the fossa ovalis with a small incision at a high level, take an 18-gauge trocar needle to puncture the main trunk of the saphenous vein above the inner ankle (if the puncture fails, make a small incision to find the saphenous vein), insert the mudskipper guidewire upward, select a straight-ended 5F light-transmitting contrast catheter, introduce the main trunk of the saphenous vein with the guidewire, withdraw the guidewire and exchange the laser fiber, at this time, you can see the red light indicating the head end of the fiber in the root of the saphenous vein in the inguinal region, turn on the laser therapy instrument, set the transmitting power to 12W, pulse time to 1s, interval 1s, recede while burning, about 1cm per second, while the assistant walks along the saphenous vein to compress and close the inner lumen of the vein; the whole process takes about 60-90s; withdraw the catheter and the laser fiber, subcutaneously puncture the superficial tortuous branches and laser closure and compression bandaging with an elastic bandage. Postoperatively, antibiotics were routinely applied for 1 day, and after 2 weeks, the elastic bandage was released and elastic stockings were fitted for 3-6 months. Postoperative pain for 3~7 days without painkiller treatment. 2.Conventional treatment method: conventional epidural anesthesia, high ligation of the saphenous vein in a small incision at the fossa ovalis, incision and dissection of the saphenous vein at the inner ankle, aspiration of the saphenous vein with an aspirator throughout the whole process, and “point” aspiration of the superficial tortuous branches. An elastic bandage was applied to wrap it with pressure. After 2 weeks, the elastic bandage will be removed and elastic stockings will be used for 3 to 6 months. Postoperative pain is treated for 3~15 days with painkillers if necessary. Conventional saphenous vein trunk surgery is more traumatic for the patient and the postoperative recovery is slower, especially when the incision is large, which can often cause complications such as delayed healing of the incision or infection, causing pain to the patient. Minimally invasive surgical method of saphenous vein, that is, after the high ligation and stripping of the main trunk of saphenous vein, small incision is taken to strip other superficial varicose vein masses, the maximum incision is only 2cm, the patient’s pain is reduced compared with traditional surgery, the postoperative recovery is faster, there is no case of incision infection, but this surgery has reached the majority of patients both to do surgery and require However, this procedure has reached the demand of the majority of patients who require both surgery and more aesthetic appearance, especially young women who are afraid of leaving surgical incision scars. The emergence of laser treatment of the saphenous vein has shown us the possibility of minimally invasive or even non-invasive surgical results for the saphenous vein, without making any incisions on the skin during the whole procedure, which minimizes the pain of the surgery. Laser treatment of the saphenous vein was first introduced in 1999 by Robert Min, an American vascular surgeon. Using the thermal action of the laser, the lining of the saphenous vein is destroyed and closed by external pressure, thus eliminating the need to strip the saphenous vein trunk and causing minimal trauma. Compared with conventional high saphenous vein ligation and stripping, it has the following advantages: (1) easy operation with small or even no incision, which is suitable for the aesthetic needs of modern patients; (2) short hospital stay; (3) faster postoperative recovery, less pain, and basically no postoperative pain medication, and short-term discharge; (4) less postoperative complications such as infection [3]; (5) short postoperative antimicrobial application time [4]. However, the following points should be noted for laser treatment cases: (1) At present, the selection of patients is still cautious, and we mainly choose trunk type with mild disease (CEAP Ⅲ or less.) For CEAP Ⅲ or above, we adopt laser closure of the trunk and “dotted” peeling of the lateral limbs to achieve the purpose of surgical cure. (2) The laser fiber must enter the saphenous vein trunk exactly under the guidance of the light before cauterization, and compression along the whole trunk of the saphenous vein to facilitate closure. (3) The receding speed of the laser fiber should be moderate to prevent skin burns and incomplete cautery leading to later recurrence [5]. (4) We perform high ligation of the saphenous vein in order to prevent damage to the femoral vein due to inadvertent entry of the fiber into the femoral vein. If the operation is skilled, the incision at the fossa ovalis can not be used and the cautery is performed directly 2 cm below the fossa ovalis, but the subcutaneous light source must be visible to make sure that the light is not in the deep vein. Laser therapy of saphenous varicose veins is comparable to conventional stripping and has the potential to replace the classical procedure, especially in patients with mild trunk-type branch lesions, but the possibility of laser treatment for CEAP IV or higher remains to be further explored.