Abstract： Objective　To evaluate the imaging technology and clinical application of spiral CTM.Methods　42 patients were examined with SCTM. The images were analyzed and reconstructed by computer software. Results　Among 42 cases, there were 27 of lumbar disc diseases, 2 of congenital bony narrowing of vertebral canal, 2 of hyperosteogeny at rear edge of vertebra, 5 of vertebral dislocation, 3 of pachynsis of yellow ligaments. All the patients received operative treatments. The SCTM made 100% positive diagnosis. Computer reconstruction software can provide the multi-plane and multi-angle images, illustrating the vertebral canal and subarachnoid cavity, the appearance, structure and connectivity of spinal nerves.Conclusions　SCTM-MPR can clearly illustrate the anatomy of vertebral canal and its contents, the pathologic changes, making a precise localization of the focus. It's believed that SCTM can be very valuable in clinical application of narrowing of vertebral canal.