Objective　To observe the anatomy of the bile ducts and its variation through revolving radiography of the bile ducts by percutaneous transhepatic cholangiography (PTC).　Methods　50 cases of PTC were carried out with 20ml syringe connected to external drainage tube and the bile duct anatomy and the variation were observed by revolving radigography of the bile ducts at the fully developing status.　Results　The variation of the bile ducts was revealed in 21 of 50 cases, accouting 42%.In 6 cases, accounting for 12%, intrahepatic bile ducts of the right anterior lobe, intrahepatic bile ducts of the right posterior lobe and left bile ducts united to form the common bile duct; In 4 cases, accounting for 8.0%, the left bile ducts first converged with the intrahepatic bile ducts of the right anterior lobe, and then they converged with the intrahepatic bile ducts of the right posterior lobe at the hepatic portal; in 10 cases, accounting for 20.0%),  the left bile ducts converged first with the intrahepatic bile ducts of the right posterior lobe, and then they converged with intrahepatic bile ducts of the right anterior lobe at the hepatic portal; in 1 case , accounting for 2.0% , multiple bile ducts formed the common bile duct at the hepatic portal.　Conclusion　Analysis of the bile duct anatomy and the variation holds a clinical significance on determination of the operative pattern.