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In order to investigate the diagnostic value of CT combined with high-resolution pelvic MRI in colorectal cancer, 179 suspected patients with colorectal cancer were selected in this study. All subjects were examined by CT and pelvic MRI. T stage, negative predictive value, positive predictive value and diagnostic efficacy were compared and observed. The results showed that the accuracy of CT in T staging was 92. 11%, and the accuracy of T staging was 98. 68% whit CT+ tug--resolution pelvic MRI. Compared with CT detection, CT+ high-resolution pelvic MRI detection showed low positive predictive value, low specificity and high accuracy, but there was no statistical significance between the two (P#0. 05). Compared with CT detection, CTH high- resolution pelvic MRI detection had higher negative predictive value and sensitivity, and the difference was statistically significant (P<0. 05). CT combined with high-resolution pelvic MRI scan for the detection of colorectal cancer patients can improve the detection rate of the disease and improve the accuracy. [ABSTRACT FROM AUTHOR]