Abstract: Objective　To provide a theoretical reference for designing the cervical anterior cervical zero-incision interbody fusion cage by measuring the anatomical parameters of the cervical intervertebral space of normal adults.　Methods　200 healthy volunteers were included into doing X-ray, the following parameters were measured on X-ray of the cervical spine neutral lateral radiographs: leading edge, midpoint, posterior margin height of the C2/C3 to C6/C7 intervertebral space, transverse diameter of the intervertebral space, sagittal diameter of the intervertebral space, best angle and depth of the screw nail insertion, angle of the intervertebral disc. The mean and standard deviation of each anatomical parameter were calculated separately.　Results　The 100 male volunteers’ average age was 31.21 years old, while the 100 female was 31.05 years old. Parameters of the male group were as follows: the transverse diameter of intervertebral space was (19.88±1.06) mm, the sagittal diameter was (19.42±1.59) mm, the leading edge height was (5.57±0.74) mm, and the midpoint height was (7.24±0.98) mm, the height of the trailing edge was (4.11 ±0.27) mm, the optimal depth of the upper screw insertion was (33.54±1.14) mm, the optimal depth of the lower screw  insertion was (24.35±1.53) mm. The optimal angle of the upper screw insertion was (41.10±2.86)°, the optimal angle of the lower screw insertion was (47.13±3.17)°, the angle of the intervertebral disc was (4.94±1.36)°.  Parameters of the female group were as follows: the transverse diameter of the intervertebral space was (18.29±0.89) mm, the sagittal diameter was (13.76±1.41) mm, the leading edge height (5.12±0.64) mm, and the midpoint height (6.68±0.67) mm, the height of the trailing edge (3.20±0.25) mm, the optimum depth of the upper screw insertion was (25.18±1.75) mm, the optimal depth of the lower screw insertion was (21.83±1.66) mm, the optimal angle for the upper screw nail insertion was (41.66±2.70)°, the optimal angle for lower screw insertion was (47.03±2.43)°, the angle of intervertebral disc was (4.80±1.38)°. There were no significant differences in the above parameters between male and female groups (P>0.05). There were statistical differences in the heights of the anterior, middle and posterior margins of the intervertebral space at the same segment, which were characterized as follows: the height of the trailing edge < the height of the leading edge < the height of the midpoint (P<0.05).　Conclusions　We can get the data of adults for designing the cervical anterior cervical zero-incision interbody fusion cage by anatomical measurement of normal cervical vertebra X-ray 

Key words: Cervical vertebra, 　 Intervertebral space, 　Anatomical measurement, 　Zero-incision, Parameters