Abstract: [Objective] To explore the clinical effect of talonavicular joint fixation with spring ligament tightening in adult flatfoot correction. [Methods] The clinical data of 30 patients with stage III flatfoot admitted to our hospital from January, 2018 to June, 2021 were analyzed retrospectively, including the fixation of talonavicular joint with spring ligament tightening and other traditional surgical treatments. To evaluate the clinical and imaging results. [Results] All patients successfully completed the operation, and there were no complications such as neurovascular injury. The average operation time was (74.2±20.4)min, and the average perioperative blood loss was (86.2±19.7)ml. The follow-up time was 11～24 months, with an average of (16.7±4.8) months. Compared with before operation, the AOFAS score increased significantly in the 12th month after operation and at the last follow-up [(64.6±3.8), (88.9±2.8), (89.3±2.6), P<0.05]. Compared with before operation, the Meary angle [(18.2±3.4), (5.2±2.0), (5.3±2.0), P<0.05], TCA angle [(23.3±3.0), (12 months after operation and at the last follow-up. Pitch angles [(15.1±2.9), (22.9±3.3), (22.7±3.3), P<0.05] increased significantly. [Conclusion] For adult flatfoot patients in III stage, the operation of talonavicular fixation combined with spring ligament tightening correction has a better clinical effect, and the the patients' gait comfort of is higher. Key words: Spring ligament, Flatfoot, Talonavicular joint