Several patients with post-operative varicose vein recurrence were recently referred to Shanghai. Through ultrasound localization, it was found that the missed traffic branch lesions and neglected small saphenous lesions were important causes of postoperative recurrence and the patient had to undergo surgery again. Such recurrence could have been avoided if the preoperative ultrasound had been performed by the attending surgeon himself. Pre-operative ultrasound examination and localization by the surgeon in person has the following effects: 1. Avoid missing lesions. Traffic vein and small saphenous vein lesions are often not obvious in appearance and must be detected by ultrasound, but the ultrasound reports of almost all hospitals in China lack the description of these two examinations. Therefore, it is easy to lead to postoperative recurrence. 2. Through ultrasound positioning, detailed blood flow direction and lesion release can be understood, which can effectively reduce blind incisions. With fewer incisions, the postoperative pain will be lighter, the chances of incision infection will be less, and the appearance will be beautiful. 3.The surgeon personally does the preoperative ultrasound examination, which can judge the disease more effectively and reduce the complications. Each patient’s varicose vein has its own peculiarities. Pre-operative ultrasound examination by the attending surgeon can make the treatment individualized and designed to avoid unnecessary recurrence and complications. In addition, it is important that the patient is in a standing position. Otherwise, the veins empty after lying flat, leading to misjudgment.