Internal ankle ulcers are mainly caused by chronic venous insufficiency of the lower limbs. The early clinical manifestation of the disease is the lower extremity superficial vein tortuous anger, leg weakness, heavy, swelling, swelling, longer course of the disease appears lower leg skin hardening, pigmentation or even ulceration, which is often said to be “old rotten leg”. The lesions are often caused by superficial vein, traffic vein, deep vein valve insufficiency, venous reflux and lower limb venous hypertension. Clinical statistics show that more than 86% of venous ulcers are accompanied by incompetent valves of the communication veins. Therefore, the main point of treatment for this disease is to solve the traffic branch venous insufficiency and deep venous valve insufficiency. The traditional saphenous vein stripping and traffic vein ligation, although it can draw off part of the traffic branch, but the traffic branch backflow in the calf is still not solved, which is often an important reason for the failure of surgery and recurrence. Moreover, the operation can be performed only after the calf dermatitis or ulcer is well controlled, and the operation is limited by the long incision, trauma, infection, delayed wound healing due to necrosis and more complications. The laparoscopic subfascial venous dissection was pioneered by a German surgeon in 1985 and involves ligating and severing the venous branches of the lower leg through the laparoscope under the deep fascia. The procedure has the advantages of small incision, little damage, simple and easy method, safe and reliable, early postoperative activity, fast recovery, short hospitalization period, and beautiful incision. Because the incision is chosen at the normal skin of the upper leg, far away from the lesion area, it shortens the preoperative preparation time, effectively reduces infection, necrosis and delayed wound healing, and effectively reduces the recurrence rate of venous ulcers. Indications: venous reflux ulcers; proven venous insufficiency.