Abstract: Objective To analyze the risk factors of prolonged residence time in ICU after surgery for Standford type A aortic dissection.Methods A total of 361 patients with surgery for Standford type A aortic dissection were selected.They were divided into prolonged residence time in ICU group and normal residence time in ICU group.Single factor analysis was used at first,and the significant factors analyzed in single factor analysis were analyzed by Multi factor analysis.Results Logistic regression analysis showed that smoking history,systolic blood pressure,white blood cell count,serum creatinine,low density lipoprotein cholesterol,thrombosis in the false lumen,apolipoprotein A-I,ventilator time were associated with prolonged residence time in ICU.Conclusion Smoking history,systolic blood pressure,white blood cell count,serum creatinine and ventilator time are the independent risk factors for prolonged residence time in ICU,and low density lipoprotein cholesterol,apolipoprotein A-I,thrombosis in the false lumen are the protective factors for prolonged residence time in ICU.