Cervical plexus nerve block, including deep cervical plexus and superficial cervical plexus nerve block. The patient was placed in the supine position with the head tilted to the opposite side, the midpoint of the posterior border of the sternocleidomastoid muscle was at the level of the fourth cervical eminence, and the needle tip was vertically pierced into the skin. When the tip of the needle touches the bone, the tip of the needle is retracted 0.5-1cm and retracted without blood or cerebrospinal fluid. Local anesthetic 5-7 ml was injected and local massage was performed to spread the drug fully. Superficial cervical plexus is the needle tip retreated to the subcutaneous, the needle tip pointing to the direction of the pedicle to pierce the skin, fan-shaped injection of 2-3ml local anesthetic. The block is completed to test the block anesthesia effect, after the block effect is fully effective, this is when the surgery can begin.