[Objective] We put forward the definition of cervical spondylosis with severe cervical intervertebral narrowing for the first time. We analyzed the imaging characteristics of cervical spondylosis with severe cervical intervertebral narrowing. [Methods] The C2/3 or C3/4 intervertebral space was defined the referential intervertebral space. The space with the most severe cervical intervertebral narrowing was defined the target intervertebral space. If the target intervertebral space height was less than or equal to 50% of the reference intervertebral space height, the target intervertebral space was defined as severe cervical intervertebral narrowing. Between January 2019 and February 2022, a total of 132 patients of cervical spondylosis with severe intervertebral narrowing were analyzed retrospectively. The imaging data included anteroposterior and lateral radiographs, dynamic radiographs and three-dimensional CT reconstruction of cervical spine. Imaging measurement parameters include: C2-C7 Cobb angle of cervical spine, Cobb angle of each cervical segment; intervertebral space height of each cervical segment, intervertebral foramen height and width, spinous process spacing in neutral position, and interspinous distance change in dynamic position of cervical spine; the spinal canal cross-sectional area and the intervertebral foramen cross-sectional area. [Results] A total of 225 intervertebral spaces were involved in severe cervical intervertebral narrowing, and 1.7 intervertebral spaces were involved per patient. The incidence of severe cervical intervertebral narrowing was the highest in C5/6, which was up to 79.55%, followed by C6/7 (56.06%), C4/5 (28.03%), C3/4 (6.82%). The average height of intervertebral space was the narrowest in C5/6 (3.22±0.86) mm, followed by C6/7, C4/5 and C3/4. There were significant differences in the height of each intervertebral space (P<0.05). C5/6 had the smallest local Cobb angle, which was a kyphotic angle, with an average of (-1.81±2.12) °. Followed by C6/7, C4/5 and C3/4. There were significant differences in Cobb angle of each intervertebral space (P<0.05). There were significant differences in the distance between spinous processes of each intervertebral space in neutral position (P<0.05). There were significant differences in spinous process spacing of each segment in dynamic position (P<0.05). There was no significant difference in the height, width and area of intervertebral foramen between the left and right sides of each segment (P>0.05). The height, width and area of C5/6 intervertebral foramen were the smallest, followed by C6/7, C4/5 and C3/4. There were significant differences in the height, width and area of each segment intervertebral foramen (P<0.05). The spinal canal cross-sectional area was correlated with the height of intervertebral space, local Cobb angle of each cervical segment and interspinous distance change in dynamic position (P＜0.05), which had no correlation with C2-C7 Cobb angle and spinous process spacing in neutral position (P>0.05). The intervertebral foramen cross-sectional area was significantly correlated with the intervertebral space height, local Cobb angle and interspinous distance change in dynamic position (P<0.01), which had no correlation with C2-C7 Cobb angle and spinous process spacing in neutral position (P>0.05). [Conclusion] Severe intervertebral narrowing was most common in C5/6, followed by C6/7. The intervertebral foramen cross-sectional area was significantly correlated with the height of intervertebral space, local Cobb angle and interspinous distance change in dynamic position.