The enhanced recovery after surgery(ERAS) has been gradually extended from its initial colorectal surgery to almost all surgical fields. However, there are few reports about the application value of ERAS in emergency surgery. The goal of this clinical trial is to evaluate the value of ERAS in the perioperative period of acute gastrointestinal perforation. All the patients will be treated by emergency operation. The changes of CRP, PA, PCT in Plasma 1 hour before operation and 1,3,7 days after operation, the operation time, the amount of bleeding during operation, the recovery time of intestinal function and the time of the first meal after operation,the incidence of postoperative complications, the degree of postoperative pain, the time of first out-of-bed activity, fatigue and mental status, quality of life, the length and the cost of hospital stay will be monitored and recorded.

Inclusion Criteria:

• Age≥14years old and ≤80 years old
• The initial diagnosis is acute gastrointestinal perforation

Exclusion Criteria:

• Patients with unconsciousness,or patients with past psychiatric history
• Patients with shock and/or severe organ failure
• Patients who are pregnant
• Patients with severe spinal deformity who are unable to receive epidural anesthesia