Objective:To explore the characteristic of percutaneous transpedicular basilar part puncture on dimensional images and its safe procedure under image guidance.Methods:12 human spines（T

4

～L

5

）were gathered from preservative cadavers.Com- puterized Tomography（CT）was used for scanning.In the transverse section of the pedicle

the angles and the width of the pedicle basilar part were measured and the statistical analyses were made.Results:The angles of the pedicle basilar part diminished from T

4

to T

8

and enlarged from T

9

to L

5

.The width of the pedicle basilar part enlarged from T

4

～L

5

.There was no significant difference in these parameters between male and female groups or between left and right sides.Conclusion:Transpedicular basi- lar part approach could be used in T

4

to T

8

but transpedicular basilar part and trans-pedicular approach can be chosen in T

9

to L

3

and transpedicular could be used in L

4

～L

5

when percutaneous vertrbroplasty is done in T

4

to L

5

.