To improve the diagnosis of retrocaval ureter.20 cases of retrocaval ureter with an average age of 33.4 years were reported. The diagnosis of this disease depends on urography and retrograde ureterography. Operation was the principal treatment. Ureter orthopedics and reduction were performed in 19 cases of type 1 (low loop) except one case of type II (high loop). After removing 3 - 4 cm retrocaval ureter with pathological changes, we anastomosed the ureter without tension and regained its normal anatomic position.B-ultrasound and excretory urography showed no stenosis and improvement of hydronephrosis.Ureter orthopedics and reduction are ideal for the treatment of retrocaval ureter.