Posterior thoracolumbar operation always chooses general anesthesia. Due to surgical trauma and rich periosteum and joint capsule innervation, patients after general anesthesia immediately feel acute pain.The use of appropriate postoperative analgesia in patients with thoracolumbar surgery is beneficial to postoperative recovery. Infusions of local anaesthetic via multilumen catheters that deliver directly to wound sites have been used for postoperative analgesia in procedures. Reducing the morbidity from both pain and nausea will make the mode of analgesia a better tolerated and more palatable option for patients. The aim of this study is to examine the effects of using local anaesthetic infusion catheters following posterior thoracolumbar surgery, and compares the outcomes of patients managed using intravenous analgesia pump infusion of systemic opioids.