The pillow is the main tool to maintain the normal position of the head and neck. This “normal” position refers to the maintenance of the physiological curve of the cervical segment itself. This curve ensures the external muscular balance of the cervical spine and maintains the physiological anatomy of the spinal canal. Therefore, an ideal pillow should be in line with the cervical physiological curvature requirements, soft texture, good breathability, low in the middle, high at both ends of the Yuan Bao shape is better. Because this shape can be used in the middle of the depression to maintain the physiological curvature of the cervical spine, can also play a relative braking and fixing effect on the head and neck, can reduce the abnormal activities of the head and neck during sleep. Second, the choice of pillow content is also important, commonly used buckwheat bark: inexpensive, breathable, can always adjust the height of the pillow; Pu velvet: soft texture, breathable, can always adjust the height; mung bean shell: not only good ventilation, and cool relief, if coupled with the right amount of tea or mint is better, but mainly for summer. Others such as duck feathers are also good, but the price is higher. Pillow should not be too high or too low, do not “high pillow”, to the physiological position is better, generally speaking, the pillow high to 8 ~ 15cm appropriate, or according to the formula: (shoulder width – head width) ÷ 2. Cervical pillow can also play a preventive or therapeutic role.