In the treatment of patients with cervical spondylosis, cervical casts, braces and neck braces are often used to achieve a stable state of the cervical spine for therapeutic purposes. This is known as cervical immobilization and braking. Generally, cervical braces are commonly used. The main function of cervical brace is to: 1. fix the cervical spine in the proper position, change the bad position to maintain the normal position. Through the role of support so that the neck muscles can rest, relieve muscle spasm, reduce local pain. 2.Restrict excessive activities of the neck to maintain local stability, reduce the traumatic inflammatory reaction caused by mutual stimulation and friction between the spinal cord, nerve roots, blood vessels and joint surfaces, and promote their dissipation and absorption. 3.Ease and improve the pressure state of the cone gap, reduce the strain and degeneration of the cervical intervertebral disc, help to recover as soon as possible, and avoid possible trauma. 4.Correct the imbalance of the internal and external balance of the cervical spine, prevent small joint disorder, misalignment and dislocation, etc., in order to maintain the stability of the cervical spine sequence and intervertebral body and inter-joint, and strengthen the supporting role of the neck. 5.It is used as a non-surgical treatment before surgery to create the necessary conditions for surgery and to prepare for postoperative fixation and braking measures. After the operation, it can reduce the traumatic reaction of the local and adjacent parts of the operation, limit the movement of the neck to prevent the compression or prolapse of the bone graft, and promote the fusion of the bone and the healing of the affected soft tissue. Cervical brace is suitable for acute neurogenic or vertebral artery type with severe neurogenic pain or vertigo symptoms; post-traumatic cervical spondylosis with severe neck and shoulder and arm symptoms; those whose affected spine is still not stable enough after manipulative treatment; some cervical spinal canal is obviously narrowed in the spinal cord type and post-surgical patients. For other diseases of the cervical spine, such as cervical fracture, cervical root slippage, cervical tuberculosis, etc., cervical brace treatment can also be used.