Inclusion Criteria:  Age 18-70, gender unlimited; The patient was diagnosed with cervical spondylosis and met the indications of posterior cervical laminoplasty; Basis of serious diseases of heart, brain, lung, kidney or other important organs, preoperative ASA score I-II; Agree to participate in the study and sign the informed consent；  Exclusion Criteria:  Preoperative ASA score ≥III; One-stage combined anterior and posterior surgery of cervical spine; Correction of cervical deformity; Patients with gastric emptied disorders (such as gastroesophageal reflux, chronic history of aspiration, delayed gastric emptied), complete obstruction of the digestive tract, and inability to use enteral preparations; Patients with high risk conditions, such as severe cardio-renal insufficiency, affecting the safety evaluation of the trial; People with mental disorders, alcohol dependence or drug abuse history; women in the period of lactation and pregnancy; People with allergic constitution or previous allergies to a variety of drugs; Other researchers consider it inappropriate to participate in this study