〔Abstract〕 Objective To investigate the accuracy of CT in the diagnosis of central lung cancer and the significance of supplementary MRI diagnosis. Methods 61 patients with central lung cancer admitted to our hospital from April 2016 to April 2018 were selected as the research data. All patients were diagnosed by CT and MRI. The diagnostic accuracy of CT alone and CT combined with MRI was retrospectively analyzed. Results The average diameter of the mass was (3.25 ± 0.76) cm.The diagnostic accuracy of CT combined with MRI was 96.72 % signifi cantly higher than that of CT alone (85.25 %), and the missed diagnosis rate was 3.28 % signifi cantly lower than that of CT alone (14.75 %), (P < 0.05). Conclusion CT diagnosis of central lung cancer has a certain value, and supplementary MRI diagnosis can further improve the accuracy, obtain more detailed and abundant imaging data, provide reliable basis for diagnosis and treatment,and have a higher diagnostic value.