Prior to saphenous varicose vein surgery, key valve tests include saphenous vein valve function testing, deep vein patency testing, and transportation vein valve function testing. The details are as follows: 1. Saphenous vein valve function test: Ask the patient to take the supine position, elevate the affected limb, and tie a rubber tourniquet at the upper 1/3 of the thigh. The patient stands for 30 seconds and then releases the tourniquet, while observing the filling of the saphenous vein varices. If the test shows positive (blood refilling within 35 seconds), it suggests incomplete function of the saphenous vein valve. 2. Deep vein patency test: After using tourniquet to block the main trunk of the superficial thigh vein, ask the patient to squat or kick the leg several times. If the superficial vein varicosity becomes more obvious, the tension increases, or there is distension and pain after the activity, it suggests that the deep veins are not patent. 3. Traffic vein valve function test: the patient should take the supine position to elevate the limb, and tie the tourniquet at the root of the thigh. The first elastic bandage from the toe up to the popliteal fossa wrapped, the second elastic bandage from the tourniquet downward winding. The patient was instructed to take a standing position and while unwinding the first elastic bandage downward, the second elastic bandage was wrapped downward. The results of the test indicate that the presence of a varicose vein in the gap between the two bandages is indicative of venous insufficiency in the transportation vein. The main significance of the flap test is to clarify the site of the lesion so that it can be carefully stripped intraoperatively to prevent recurrence of the saphenous vein after surgery.