Abstract: In order to provide the morphological data for establishing human cerebral vascular diseases model using miniature swine, the cerebral arterial circle and basilar artery were studied by means of 14 vascular specimens of the 3-5 months old miniature swines. The results were as follows：① The composition of the cerebral arterial circle was similar to that of human and some other swine breeds, but it differed from human and some other swine breeds that the proximal segments of both right and left lateral posterior cerebral artery connected in the manner of obtuse angle in 8 of the 14 specimens. According to the classification of гиидчe, most （11/14，78.6%） of the cerebral arterial circles of the miniature swines were equi-valent to the primary type and the others, the transitional type.②After recieving the branches of the occipital artery, the vertebral artery formed the cerebral-spinal artery which entered into the vertebral canal. After recieving the branches on the opposite side the cerebral-spinal artery formed the cerebral-spinal circle. The circle gave rise to the basilar artery and spinal-ventral artery.③The course of the basilar artery was similar to the usual pattern found in domestic animals.The whole course was curved and only one curvature was found in most of the specimens.The calibre of it becomed narrower as passed anteriorly.

Key words: Cerebral arterial circle, Basilar artery, Miniature swine, Morphological, Characteristics