To investigate the differenec of patients' satisfaction and information gain betweem face-to-face interview and video introduction

We made up a video which showed the type, the method, the risk, and the benefit of all anesthesia with words, pictures, and image. A study nurse will ask the will of patients. The patients enrolled in the study will be randomly divided into traditional group(control group) and study group(study group). The study group will watch the video at first, then our anesthesiologist visit the patient. The control group will receive traditional anesthesiologist visit. After doctors' visit, the patients have to complete a test and a questionnaire. The patients who don't participate in the study will have traditional visit and no test.

Inclusion Criteria:

• All adult patients were included who were scheduled to undergo elective surgery

Exclusion Criteria:

• Postoperative stay in the intensive care unit was expected or unexpected.,Repeated general anesthesia had been performed in the previous 6 months,ASA classification was more than or equal to III,There were pronounced cognitive and or speech barriers