The varicose veins of lower limb can be seen at the surface of the leg with bulging, dilated and tortuous veins, and some of them will be curled into clusters in the shape of earthworms, which are generally obvious in the lower leg, and the varicose veins can also be seen in the thigh in serious cases; some patients’ symptoms of soreness, swelling and pain are aggravated after walking. After the treatment is delayed, the affected limb will have skin atrophy, ulceration, as well as flaking, pigmentation, eczema, and even the formation of ulcers for a long time without healing, which is often referred to as “old rotten leg”, the traditional surgery needs to draw off the varicose veins, the surgery is more painful, and there is a varying number of scars. Dr. Robert Min, a vascular surgeon at Cornell University Well School of Medicine, invented the Venous Laser Minimally Invasive Technology (EVLT) in 1999 and successfully applied it in clinical practice, which quickly became popular in major hospitals in Europe and the United States, and was first introduced in China in 2001 and carried out in major hospitals in Beijing and Shanghai with good clinical results. The laser is scattered isotropically at the end of the laser fiber placed in the lumen of the vein, which is absorbed by the surrounding tissues and converted into thermal energy through photothermal effect, causing denaturation and inactivation of proteins or enzymes in the vessel wall, vaporizing the tissues, destroying the structure of the vein wall, causing microscopic repair of the damage, causing fibrosis of the vein, contraction and closure of the vein, opening up the segment of the vessel, and achieving the same effect as stripping. Endovenous laser treatment is less traumatic, the operation time is shorter, the limb is basically scarless, and the treatment can be performed in stages and phases, which is especially suitable for patients with high requirements for limb aesthetics. Because it can be treated in stages and phases, it greatly reduces the surgical trauma and provides surgical opportunities for those elderly patients who cannot tolerate larger surgical trauma. Sun Yuan, Department of Vascular Surgery, Subei People’s Hospital