Objective To explore and analyze the application value of MRI 3D technology in talus damage assessment. Methods Choose 26 talus damage patients who were admitted in our hospital from January 2011 to January 2014, all patients were confirmed talus damage by biopsy or surgical pathology examination. Respectively for patients with arthroscopy and MRI, observe results and analyze the characteristics of images. Use MRI 3D technology to evaluate talus damage. Results There's no significant difference in the left-right diameter of the inside focus, the anteroposterior diameter of inside focus or depth of inside focus (P＞0.05). By biopsy or surgical pathology examination as gold standard, we found that the sensitivity of MRI diagnosis was 90.0%(20/23), the specificity was 95.7%(22/23), the accuracy was 91.3%(42/46); the sensitivity of arthroscopy diagnosis was 95.7%(22/23), the specificity was 95.7%(22/23), the accuracy was 95.7%(44/46), there's no significant difference in them (P＞0.05). Comparing sequence image quality of three groups , the results showed that T2-3D-space-fs sequence images were more clear than T2-2D-space-fs sequence images, T2-3D-space-fs sequence images were clearest, which would diagnose talus damage easily. Conclusion T2-3D-space-fs sequence of MRI 3D Technology has a significant clinical application value in talus damage assessment, the images have obvious imaging characteristics, they are clear, which has an important value in the diagnosis and injury assessment of talus damage.