Objective To evaluate single balloon dilatation and placenment of the stent for the treatment of Budd Chiari Syndrome.Methods Thirty four patients with Budd Chiari Syndrome underwent covagraphy catheterized through superior and inferior vena cava (IVC) simultaneously and single balloon dilatation of IVC and placement of metallic stents.Results Puncture and dilatation were successful in 33 patients.The obstructed segments of IVC were dilated to 10～20 mm in diameter.Nine metallic stents were placed in 9 cases. The caval pressure below obstruction were reduced from(2.71?0.78) kPa to(1.98?0.85) kPa in average.Conclusions Covagraphy catheterized through superior and inferior vena cava (IVC)simultaneously reveals the site and length of the obstruction clearly.Insertion of large single balloon is technically simple and dilatation is definite.Restenosis in segmental type may be prevented by stent insertion.