Abstract: Objective To evaluate spiral CT scan of advanced gastric cancer and determine the value of invasive depth.Methods We collected the CT image data in our hospital,and confirmed for 63 advanced gastric cancer patients by pathology department.We further analyzed the coincidence rate between T stage and pathological stage.Results CT preoperative T stage for accuracy rate was 77.78%.The accuracy rate for CT-T₁ stage was 40%.The accuracy rate for CT-T₂ stage was 83.33%.The accuracy rate for CT-T₃ stage was 76%.The accuracy rate for CT-T₄ stage was 88%.Conclusions Spiral CT scan could accurately judge the local invasive depth and guide preoperative stage and clinical treatment options in gastric cancer patients.