First, orthopantomographs were observed for atlantoaxial dislocation, fracture or absence of the dentate process (open-mouth film); whether the transverse processes of the seventh cervical vertebra were overgrown, and whether there were cervical ribs. The hook vertebral joint and the intervertebral space are widened and narrowed. Second, the lateral film 1, the change of curvature: cervical spine straightening, physiological protrusion disappearance or anti-curvature, in addition to the patient’s projection position, projection angle and other technical factors, there may be several reasons: First, the soft tissue of the neck occurs acute sprain or fibrous weaving, pain is severe or there is muscle tension, can affect the normal posture and activities of the neck. Second, cervical disc herniation or cervical spondylosis with nerve root irritation symptoms, the lesioned segment of the vertebrae fixed immobile or the vertebral gap has a narrow front and wide back and the phenomenon of posterior protrusion. Third, due to the different sites and degrees of cervical disc degeneration, changes in curvature and local rotation or distortion may occur, which may be manifested as local spine distortion; joint protrusion, vertebral root notch and posterior edge of vertebral body are double shadowed. In lateral radiographs, the following three conditions have clinical significance: (1) one or two cervical vertebrae have double shadowing of the intervertebral articular processes, which is called the double convexity phenomenon; the vertebral root notch has double shadowing, which is called the double concavity phenomenon; the posterior edge of the vertebral body has double shadowing, which is called the bilateral phenomenon, while the upper and lower cervical vertebrae are normally shadowed, indicating that the cervical vertebrae are rotated. (2) The upper cervical vertebrae show normal shadowing, while the lower cervical vertebrae show biconvex, bilateral, or biconcave phenomena; or the lower part is normal while the upper part has similar changes, indicating that the junction has rotation. (3) One or two vertebrae of the cervical vertebrae appear normal, while its part has the phenomenon of double convexity, double concavity and bilateral, indicating that the cervical vertebrae that appear normal have the phenomenon of rotation, such as the posterior part of all cervical vertebrae presenting double convexity, double concavity and bilateral phenomenon, it is the cause of improper projection and has no clinical significance. 2, there is abnormal mobility: in the cervical spine hyperextension hyperflexion lateral X-ray film, can see the elasticity of the intervertebral disc changes, good elasticity, relatively stable, its mobility is small and similar to the upper and lower intervertebral discs; severe cases can be seen with slippery vertebral phenomenon, manifested as the anterior and posterior edges of each cervical vertebrae are not aligned. This phenomenon is helpful for the diagnosis of the localization of the diseased disc and the understanding of bone grafting after surgery. 3, bone superfluous: the front and rear of the vertebral body close to the disc can produce bone superfluous and ligamentous calcification. The posterior bone superfluous is easy to cause symptoms. However, the size of the bone superfluous is not proportional to the severity of clinical symptoms, thus the bone superfluous is not obvious but the spinal cord compression is obvious, the bone superfluous is large but the clinical symptoms are not obvious can occur. 4, narrowing of the intervertebral disc: the intervertebral disc thins due to nucleus pulposus herniation and fibrous degeneration of the intervertebral disc due to reduced water content, which is manifested in the narrowing of the intervertebral disc on X-ray plain film. 5, subluxation and small intervertebral foramen: after the disc degeneration, the stability of the intervertebral body is poor, the vertebral body occurs subluxation, or called slipped vertebrae. Subluxation of the vertebral body causes the transverse diameter of the intervertebral foramen and the anterior and posterior diameter of the spinal canal to become smaller and produce clinical symptoms. 6, calcification of the collar ligament: clinically when the collar ligament calcification, and its corresponding intervertebral disc has long appeared degenerative changes. This is because after the degeneration of the intervertebral disc, the corresponding segment of the collar ligament is loaded more. Before the ossification of the collar ligament, the local ligament tissue undergoes the stage of degeneration and chondrogenesis, which can be palpated clinically with local sclerosis, but the X-ray plain film cannot show it. 7, oblique film: take a double oblique film of the cervical spine, mainly used to observe the size of the vertebral foramen and the osteophytes of the hook vertebral joint. After the hyperplasia of the hook vertebral joint, the intervertebral foramen becomes smaller, which can be shown in the cervical oblique film, and it is the cause of nerve root irritation and vertebral artery insufficiency of blood supply. However, some clinical cases with significant osteophytes that occupy 2/3 of the transverse diameter of the intervertebral foramen are also asymptomatic.