Abstract: The present paper presented some data about the course, flexure, diameter and length of external cranial segment of the vertebral artery obtained from observation and measurement in 31 chinese corpses. 1. 6.5% of the second part of the vertebral artery were compressed by the large uncovertebral joint and presented flexures in the corresponding site. 2. There existed 6 flexures in the third part of the vertebral artery and marked changes were fovnd in the first and second flexures. 3. The diameters in most parts of the tfcl vertebral artery were greater than those on the right. In individual case the diameter of the left vertebral artery differs markedly from that of the right. 4. The meana vlue of the length of the extracranial segment of the vertebral artery were as follows: Left, 192. 41mm right, 189. 67mm. In adaition, some problems about the division of the vertebral artery and the mechanism of the cervical spondylopathy and others were also discussed and analysed in this paper.