1.Tilt the bed to 60 degree angle, the patient’s back against the bed semi-standing on the footrest, the healthy limb under the foot pad a 10-20cm thick board, so that the affected limb suspended, conducive to the longer stay of the contrast agent in the calf vein. 2.Tie a tourniquet above the ankle joint with the pressure above and below 16kPa to force the contrast agent in the superficial vein to enter the deep vein through the traffic branch, and then wrap a bandage evenly in the calf or tie a tourniquet above the knee joint with the pressure above and below 26,7kPa to slow down the flow of contrast agent and increase the filling degree. If you need to observe the thigh veins at the same time, you can tie a tourniquet at the root of the thigh as well. 3.Puncture the superficial dorsal foot vein with a 19~21 gauge scalp needle and inject 60ml of 76% pantethine with 20ml of saline within 2~3min. Generally, when the contrast agent is injected to 1/2, the deep calf vein can be observed under fluoroscopy, and when the filling is satisfactory, a frontal and lateral calf film can be taken. When the film is satisfactorily filled, a frontal view of the calf can be taken. The toe should be rotated inward by about 20 degrees to avoid overlapping the blood vessels with the bone, then the bed should be placed at 45 degrees and the tourniquet above the knee joint should be relaxed. The bed is then lowered to 20 degrees and a frontal thigh view is taken when the contrast is about to be injected. If you want to observe the pelvic vein, put the bed to the level, loosen the tourniquet at the root of the thigh, push the complete contrast injection, ask the patient to lift the lower limb quickly, move the ankle joint, and take the orthogonal pelvic film. 4.Or without a tourniquet, the patient lies supine on a bed tilted at 60 degrees, with the healthy side weight-bearing and the affected side foot hanging in the air. When 2/3 of 60 ml of contrast agent is injected through the dorsal foot vein, the ortho-lateral view of the lower leg is taken, and the ortho-lateral view of the thigh is taken after the full amount is injected. The pelvic film was then taken on a flat bed. In case of significant varicose veins, a bandage should be wrapped around the calf to prevent the contrast agent from staying too long in the superficial veins.