Abstract: Objective　To explore the safety operation area of posterior percutaneous endoscopic cervical discectomy.　Methods　20 adult cervical spine specimens were taken to measure the distances between the V-point and the lateral spine dura mater, the horizontal and vertical distances between the V-point and the vertebral artery, and the width of the facet joints on the left and right sides of C3/C4 to C6/C7 respectively. Statistical comparison of the data was made.　Results　The distance between the V point and the lateral spine dura mater was: left (1.31±0.32~2.46±0.60) mm; right (1.29±0.35~2.75±0.45) mm. There was no  statistical difference between left and right of the same level, but there was statistical difference among different segments. The horizontal distance between point V and vertebral artery was: left (2.17±0.42~5.10±0.93) mm, right (1.99±0.39~5.00±0.71) mm. There was no statistical difference between left and right of the same level, but there was statistical difference among different segments. The vertical distance between point V and vertebral artery was: left (11.05±1.06~13.47±1.12) mm, right (11.33±1.20~13.61±1.01) mm. There was statistical difference between left and right of the same level，but no statistical difference among the segment of C3/C4 and C4 /C5. The width of facet joints was: left (10.79±0.93~12.66±0.88)mm，right (10.86±0.68~12.54±0.70) mm.　Conclusions　The safety operation area of posterior percutaneous endoscopic cervical discectomy should be controlled within the range of 1.20~2.00 mm from C3/C4 to C6/C7 on the medial side of the V-point.  When the grinding range is more than 2.00~5.00 mm from the C3/C4 to C6/C7 on the lateral side of the V-point, it may reach the body surface projection of vertebral artery. Therefore the depth of surgical entry should be controlled at 11.00~14.00 mm from segments of C3/C4~C6/C7 to the V-point.

Key words:  Cervical vertebra, 　Posterior, 　Applied anatomy, 　Endoscope, 　V-point