Objective To evaluate the clinical indicat ion and effect of inferior vena cava filter. Methods 17 cases of deep venous thrombosis were treated w ith insertion of the inferior vena cava filter. In 4 cases the thrombosis were d rawn by Hydrolyser catheter with popliteal vein punction, in another the thrombo sis were analysed by Urokinase with vena dorsalis pedis injection.Results The filters were successfully inserted. No seious complication were observed. The thrombosis were discharged in 2 cases with Hydr olyser catheter ,and in 4 cases with Urokinase analyse. No pulmonary thromboembo lism was observed.Conclusion The inferior vena cava filter insertion is a e ffective method to provent pulmonary thromboembolism, and a safe step for the in tervenional therapy to the deep venous thrombosis.