Objective To explore the value of multi slices spiral computed tomography(MSCT) in the diagnosis of hepatopetal collateral branchveins cause by cavernous transformation of the portalvein(CTPV). Methods 40 cases of CTPV were diagnosed by CT in our hospital, plain scan and contrast-enhanced apiral CT were performed in all patients. Imaging data were postprocessed with Maximum intensity projection(MIP), multi-planar reconstruction(MPR), Volume rendering(VR) on blood Vessel to display the abnormal portal vein and hepatopetal collateralbranch veins. Results In the 40 cases of CTPV, 37 patients could clearly show the relationship between CTPV to the origin, route and the surrounding organs of the hepatovenous vein, Which canestimate the source of the lateral branch vein. Their numbers accounted for 92.5% of the total.The following three hepatopetal collateral branchveins is the main performances: ①28 cases of lateral branch opening of the gallbladder, accounted for75.6%, ②There are 16 cases of the lateral branch opening of around common bile duct collateral, accounting for 43.2%, ③11 cases of lateral opening of around the pancreaticoduodenum, accounted for29.7%. In addition. There are 3 cases can only show the honeycombed lateral branch of the portal vein, accounting for7.5%. Conclusion MSCT examination can optimize the display of the collateralbranch vein,Where can accurately identify the beginning and end of routes to hepatopetal collateralbranch veins. Which is an important method to diagnose the CTPV.