Spinal deformity is a kind of three dimensional deformity.X-ray and conventional CT can not display accuratelly the deformity of their very complicated osteal structure,but post-processing technique of spinal CT can provide actual evidence for diagnosing of spinal deformity.The purpose of this article is to introduce the application of post-processing technique of MPR,CPR and VRT,the employment of this technique can accurate diagnosis and evaluation of the disease in pre-and post-operation.