[ABSTRACT] Objective To investigate the clinical efficacy of laminectomy with articular process reservation in the treatment of thoracic spinal canal tumors. Methods There had 5 patients with thoracic intraspinal tumors accepted treatment in our hospital from February 2012 to October 2014. All these patients accepted surgery via posterior approach. All these 5 patients underwent laminectomy with more than two-thirds articular process reservation. On this basis, the thoracic spinal canal tumor is removed. The surgical outcome was evaluated using the Japanese Orthopaedic Association (JOA) scoring criteria. The improvement rate = [( follow-up score - preoperative score) / (17 points - preoperative score)] × 100%. The change of Cobb angle in the spine was used to evaluated the stability of the spine after operation. Results All 5 patients were followed up for 12 to 48 months. The JOA mean score increased from 7.5 points (5-10 points) before surgery to 16.5 points (16-17 points) after surgery, with an average improvement rate of 94.7%. All patients did not show an increase in Cobb angle. There was no significant change in the sagittal line of the spine, and there was no instability in the spine. There was no significant change in the activity of the spine during the follow-up. Conclusion The laminectomy that preserves the articular process can achieve the removal of the tumor in the thoracic spinal canal while maintaining the stability of the spine, and is a reliable surgical method for thoracic intraspinal tumor removal.