Purpose : With the technical advancement in arterial embolization and subsegmental resection of liverneoplasm, emphasis has been on more detailed knowledge of normal arterial anatomy and its variation. We analysedthe patterns of intrahepatic branches of right hepatic artery. Materials and Methods : We retrospectively analyzedintrahepatic branching patterns of right hepatic artery in 165 cases. All cases had a single right hepatic arterywhich could be traced up to tertiary branches, and also performed rapid drip infusion CT scan, hepaticarteriography with antero-posterior and oblique views, superior mesenteric arteriorgraphy and indirectportography. Results : Intrahepatic branching patterns of the right hepatic artery had eight types of variation.The most common intrahepatic branching pattern was type I:107(64.5%) which represented 5, 8th branch emerging fromthe anterior segmental artery and 6, 7th branch from the posterior segmental artery. Type VII:26(15.8%) was thenext common type which represented 6th branch emerging first from the posterior segmental artery and 7th branchemerging secondly from the posterior segmental artery. Type VII, VI, III were branched from the posteriorsegmental artery. Type IV, II, V were branched from the anterior segmental artery. Conclusion : These result couldbe helpful to the planning of treatment, such as hepatic subsegmentectomy or transarterial embolization of thehepatic neoplasm.