Traditional saphenous vein high ligation and extraction, varicose vein stripping is the classic surgery for treating varicose veins in lower limbs, but because of its defects such as long hospital stay, many incisions and heavy postoperative incision scar affecting the beauty, especially many female patients who require beautiful legs are afraid of this surgery so much that they delay the disease. With the continuous improvement of living standards, some patients, especially young female patients, put forward higher standards for the level of treatment, requiring not only the treatment of disease and prevention of complications, but also less incisions, small incisions or even no incisions, requiring post-operative aesthetics, etc. Radiofrequency ablation vein closure is a novel treatment for saphenous varicose veins, which has been carried out in recent years with satisfactory results in Europe and the United States and other countries. Currently, several multicenter prospective clinical randomized controlled studies have confirmed the safety and effectiveness of endovenous radiofrequency closure for the treatment of saphenous varicose veins. The radiofrequency ablation method has been successfully applied in cardiology for the treatment of arrhythmias. Experiments have shown that high-frequency waves of 200 kHz ~ 3000 kHz do not stimulate neuromuscular cells, so the destruction of tissue structures by radiofrequency methods is safer than other mechanisms. The mechanism of radiofrequency ablation treatment is local hyperthermia of the tissue within a limited range (<1 mm) in contact with the transmitting electrode only, which denatures it and the heat is rapidly dispersed during conduction to the surrounding tissues, preventing the heat from spreading to the deeper tissues. Sufficient local heat acts on the vein wall during radiofrequency ablation, causing collagen contraction and endothelial cell exposure, which leads to vein wall thickening, lumen contraction, rapid mechanization and formation of fibrous strips, and eventually vein closure. The VNUS endoluminal closure system is automatically controlled by a computer, so that if coagulation or charring of tissue occurs, the resistance increases rapidly and the temperature decreases immediately. In addition, if blood tissue is encountered, the resistance decreases significantly, ensuring the effectiveness of the treatment by increasing the duration of action to a high enough temperature to act on the vein wall. During the entire RF ablation process, if the temperature and resistance of the treatment continues to exceed the default range of the host, the machine will automatically shut down to ensure the safety of the treatment. van den [5] reported a meta-analysis of endovenous minimally invasive treatment of varicose veins in the lower extremities, which included 119 studies of 12,320 varicose limbs with a mean follow-up of 32.2 months, with success rates of 78% (70%-84%), 77% (69%-84%), 84% (75%-90%) at 3 years after stripping, foam sclerotherapy, radiofrequency closure, and laser treatment, respectively (75%-90%) and 94% (87%-98%), respectively. The authors concluded that foam sclerotherapy, radiofrequency closure, and laser therapy were as effective as traditional surgical debridement. badri reported a statistically insignificant difference in patient symptom improvement rates between radiofrequency closure and surgical debridement, but a statistically significant difference in patient recovery time of 6.5 d after radiofrequency closure and 15.6 days after surgical debridement. The results of the comparison between radiofrequency closure and laser treatment: the technical success rate of laser treatment was 100% and that of radiofrequency closure was 96%, and the difference was not statistically significant; the complication rate of laser treatment was 20.8% and that of radiofrequency closure was 7.6%, and the difference was statistically significant. The recurrence rate after foam sclerotherapy was 30.5% 1 year after surgery and up to 51% 10 years after surgery. Domestic single equal reported the results of the control study of venous radiofrequency closure and traditional stripping for varicose veins in the lower limbs. Compared with traditional surgery, radiofrequency treatment has the advantages of simple operation, small trauma, no incision, short hospital stay and fast recovery, which avoids the shortcomings of traditional surgery such as larger vascular bed damage, large and many incisions, more bleeding, long postoperative pain and bed rest, and high complication rate. We use the radiofrequency closure catheter placed through the puncture method to achieve incisionless treatment of varicose veins, further reducing the trauma. The mechanism of endovenous laser treatment and catheter electrocoagulation for saphenous varicose veins, which have been widely carried out in China, is to cause the blood in the veins to coagulate and form thrombus so as to achieve the purpose of closing the saphenous veins, but the potential thrombus recanalization rate is high and there is a risk of thrombus dislodgement leading to pulmonary embolism. In contrast, the temperature of radiofrequency treatment is controlled at about 85°C, which avoids burning, coagulation, vaporization and charring of tissues, and the machine will automatically shut down when the treatment temperature and resistance continue to exceed the safety range set by the radiofrequency machine, thus ensuring the safety of the treatment; at the same time, the collagen contraction of the vein wall reduces the possibility of recanalization of the treated vein, theoretically avoiding the deficiency of the high recanalization rate of the above treatment modalities. In terms of patient selection, it should be noted that the following patients are not suitable for incisionless endovenous radiofrequency ablation closure combined with electrocoagulation: ① those with a saphenous vein trunk diameter greater than 10 mm; ② those with branched varicose veins with thrombophlebitis masses that require incisional debridement; ③ those with branched veins that are obviously varicose in masses that are not suitable for electrocoagulation and require incisional debridement; and varicose veins with unhealed ulcers. In conclusion, endovenous radiofrequency ablation closure combined with electrocoagulation for varicose veins of lower extremities is simple, practical and aesthetically pleasing to meet the patients' requirements for aesthetics, and is favored by female patients. However, attention should be paid to the selection of indications. Only by building on the strengths and avoiding the weaknesses can it become the ideal treatment for varicose veins in the lower extremities.