Inclusion Criteria:  Able and willing to provide a written informed consent Subjects requiring elective general anesthesia endoscopic surgery of the lower abdominal Male or female Meet the body mass index standard Conform to the ASA Physical Status Classification  Exclusion Criteria  Subjects with a history of difficult airway Subjects with a history of mental illness Subjects with a history of cognitive impairment epilepsy Subjects with a history of myocardial infarction or unstable angina pectoris Subjects with atrioventricular block or cardiac insufficiency Subjects with a history of ischemic stroke or transient ischemic attack Subjects with poor blood pressure control after medication Subject with a history of substance abuse and drug abuse Abnormal values in liver function Subjects with an oxygen saturation below 90% on room air Allergic to drugs that may be used during the study Pregnant or nursing women No birth control during the specified period of time Participated in clinical trials of other drugs (received experimental drugs) The investigators determined that other conditions were inappropriate for participation in this clinical trial