Adult patients undergoing elective non-cardiac surgery were enrolled. Anxiety before the operation was evaluated by The State Anxiety Inventory (S-AI). Logistics regression would be used for identifying the independent factors of preoperative anxiety and prediction model would be established.

Inclusion Criteria:

1. patients undergoing elective with general anesthesia surgery (gynecologic oncology, general surgery, orthopedics and urinary);
2. The estimated operation time is more than 2 hours. 3)18≤ age ≤ 80;

4)be able to communicate normally in daily life, without serious hearing and visual impairment; 5)ASA:I-II; 6)sign informed consent and volunteer to participate in this study.

Exclusion Criteria:

1. Having a history of brain diseases, such as stroke, epilepsy, psychosis other history of neuropsychiatry.
2. Patients with serious diseases of heart, liver, lung, kidney or other organs.
3. Having a definite diagnosis of cognitive impairment, such as Alzheimer's disease;
4. Those who use sedatives before evaluation in this study;
5. Drug addicts;
6. Alcoholics;
7. pregnant women;
8. participated in other clinical trials as a subject in the past 3 months.

patients who met the eligibilty criteria for elective surgery under general anesthesia.