Abstract： Objective To evaluate the postoperative changes of spinal stability and relevant factors followed posterior approach via hemilaminectomy and facetectomy for removal of dumbbell shaped cervical spinal cord tumor. Method The authors retrospectively analyzed a series of 25 patients with dumbbell intra -extra spinal tumors surgically treated through hemilaminectomy and facetectomy from 1999 to 2009. 30 patients with intra - spinal tumor removed through hemilaminectomy approach during the same period were chosen as comparative group. The clinical and radiographic data were reviewed. The short and long - term follow - up was performed to evaluate the clinical outcome and biomechanical change of the spine. Results 25 operations had been performed with gross total of tumor resection in all cases with histological of neurolemomas in 19 cases, neurofibroma in 1 case, ganglioneuroma in 5 cases. As comparative group, 30 tumors which had been removed successfully including neurolemomas in 24, meningiomas in 6 cases were analyzed. The short - term clinical outcome was satisfactory in the two groups ( P ＞ 0. 05 ). The period of follow - up was ranged from 7 months to 10 years with average of 4. 28 years. There was no change in terms of range of motion of cervical spine in both groups The incidence of worsen of cervical curvature was found to be 8％ in research group, 10％ in comparative group ( P ＞ 0. 05 ). The incidence of cervical spinal instability during the follow - up period was 4％ in research group, and 3％ in comparative group ( P ＞0. 05). During the follow- up, no significant different was found between the two groups in terms of long - term clinical outcome ( P ＞ 0. 05 ). Conclusions Benign dumbbell shaped spinal cord tumor of cervical spine are well exposed and totally removed with satisfactory outcome via hemilaminectomy and facetectomy approach. Compared with hemilaminectomy, hemilaminectomy and facetectomy equally pose little impact of cervical curvature, range of motion, and spinal stability.