In order to find a method to determine the location and depth of epidural puncture through intervertebral foramen, the distance between both intervertebral foramina and the depth from epidural space to lumbodorsal skin were measured with computerized tomography(CT). These data were taken as a guide during lumbar epidural puncture through intervertebral foramen in 12 fresh corpses ,and needles were all successfully inserted into epidural spaces. Afterwards, this method was applied to the lumbar epidural puncture of 60 adult patients with lumbar vertebral disk herniation, in the sense that the distance between both intervertebral foramina and epidural depth were measured with CT as the guide in the epidural puncture through intervertebral foramen; only at sigle puncture, the epidural spaces of 56 cases were successfully inserted into ,with the rate of success being 90.3%. It is suggested that the dis- tance between both intervertebral foramina and epidural depth measured by CT, paly an important role in successful lumbar epidural puncture through intervertebral foramen.