Normal anatomic variation of anterior cerebral artery are analyzed in 100 normal carotid arteriogram which were done at Dept. of Rdiology, Seoul National University Hospital during period of August 1965 to June 1971. With lateral view of arteriogram, the anterior cerebral artery is divided to 4 parts. Part I of the anterior cerebral artery begins at its derivation from internal carotid artery and ends before the vessel enclose the genu of corpus callosum. Part II surrounds the genu of the corpus callosum. Part III begins after the curve of part II is completed, and continues to the first sign of tortuousity in the pericallosal artery. Part IV extends to the most distal part of that vessel. The configuration of the each part and origin of branches are analyzed as follow ; Part I shows superior and posterior convexity in 82%, semivertical straight course in 9%, and straight horizontal course in 8%. Part II shows gentle curve in 51%, acute angulation in 14 %, wide curve in 19%, and square pig nose form in 16%. Part II forms a round and smooth course with its convexity upward in 77%, smooth curve with convexity downward in 16%, and horizontal straight course in 7%. Part IV is biphasic or triphasic in about equal incidence.