Objective:To explore the diagnostic value of multiplanar reconstruction (MPR ) and volume reconstruc‐tion (VR) technique of 128‐slice spiral CT angiography (MSCTA) for aortic dissection (AD) .Methods :A total of 48 AD patients received continuous thin layer scanning before and after enhancement .The obtained images were de‐livered into workstation to perform MPR and VR reconstruction .Observation and analysis in continuous lay were performed in both techniques respectively .Debakey typing of AD was performed ,and intimal breach ,true and false lumen display ,thrombus and plaques etc .displayed by two reconstruction techniques were statistically analyzed .Re‐sults:Among the 48 AD patients ,there were 22 cases (45. 83% ) with DeBakey type Ⅰ ,10 cases (20. 83% ) with DeBakey typeⅡ and 16 cases with DeBakey type Ⅲ ,the incidence of typeⅠwas significantly more than that of typeⅡ (P<0.05) ,but there no significant difference between type Ⅱ and type Ⅲ (P> 0.05) .MPR technique dis‐played that there were 46 cases (95. 8% ) with true and false lumen ,48 cases (100% ) with intimal breach ,42 cases (87. 5% ) with thrombosis and 18 cases (37. 5% ) with vascular wall plaques .VR technique displayed that there were 43 cases (89.6% ) with true and false lumen ,12 cases (25.0% ) with vascular wall plaques ,but it didn't display lu‐men intimal breach and thrombus .MPR technique was significantly superior to VR technique in displaying intimal breach (100% vs .0% ) ,thrombus (87.5% vs .0% ) and lumen plaques (37.5% vs .25.0% ) ,P<0.05 or <0.01 , but there was no significant difference in displaying true and false lumen between them , P>0.05. Conclusion:The multiplanar reconstruction technique of 128‐slice spiral CT angiography possesses more diagnostic value than that of VR for aortic dissection .