Twenty-three patients (28 extremities) suffering secondary ulcer after high ligation and stripping of great saphenous vein were chosen to receive muscle flap formation of potiteal vein. Of which, 21 patients (25 extremities) ulcer scabbed within one week and healed in 2 weeks after operation. The other s were cured in 5 weeks. All patients were followed up 6-12 months with no recurrence and satisfactory results.