Neck brace is an adjunctive therapeutic device for cervical spondylosis, which can be worn, but is not mandatory. Cervical brace mainly has the function of restricting the activity of cervical vertebrae and opening the small joint space. 1. Limit the activity of cervical spine: it can reduce the repeated friction and adverse stimulation to the compressed spinal cord and nerve roots, and help the edema and inflammation of the spinal cord, nerve roots, joint capsules, muscles and other tissues to subside. 2. Enlarge the intervertebral space and intervertebral foramen: it can reduce or even contact the irritation and compression suffered by the nerve roots. 3. Relieve muscle spasm: promote the restoration of the balance of the cervical spine, reduce the internal pressure of the intervertebral discs, and buffer the pressure of the intervertebral discs in all directions. 4. Open the small joint space: promote the restoration of the normal sequence and interrelationship between the cervical vertebrae. Improve the blood and oxygen supply to the vertebral artery. Cervical brace plays a role in braking and protecting the cervical vertebrae, reducing nerve abrasion, alleviating the traumatic reaction of the intervertebral joints, facilitating the subsidence of tissue edema and consolidating the therapeutic effect, preventing recurrence. It is used for all types of cervical spondylosis, especially when the cervical spine compresses the nerve, wearing a neck brace, the effect is better. Different patients with different cervical heights and neck circumferences should wear different types of neck braces under the guidance of doctors.