Objective To explore application value of 16 detecter spiral CT angiography for dissecting aneurysm of aorta .Meth-ods Retrospectively analyzed 9 cases of patients with the dissection of superior mesenteric artery in admission from January 2010 to December 2012 ,the cases were diagnosized by 16 detecter spiral CT angiography for dissecting aneurysm of aorta .post-process-ing techniques such as maximum density projection ,multi-plane reorganization and curved surface reconstruction and volume were used analyzed and diagnosized .Results These pathological changes such as superior mesenteric artery sandwich of true ,false cavity and inner diaphragm ,broken mouth position ,sandwich cumulative range and whether merger thrombus ,branch vascular involve-ment could be displayed by 16 detector CT vascular imaging and post-processing technology .Conclusion 16 layer detector CT ima-ging and post-processing techniques of blood vessels could clearly show the mesenteric artery sandwich ,which might be play an im-portant role for timely and accurate diagnosis .