Varicose veins in the lower extremities are a blood reflux disease that often occurs in the saphenous vein and its branches. Endovenous laser treatment uses the thermal damage caused by the laser to occlude the saphenous vein. The principle of endovenous laser treatment is to deliver an external laser through a small-diameter optical fiber inside the vein, causing the blood in the lumen to boil and produce vapor bubbles, the volume of which is directly related to the laser energy, causing extensive thermal damage to the endothelium and lining, ultimately leading to vein occlusion. Compared with traditional surgery, it has the advantages of small surgical incision, less bleeding, less pain, quick recovery, early activity, short hospital stay, and significant cosmetic effect, which is especially attractive to female patients.