[Objective] To investigate the clinical outcomes of mini plate combined with countersunk screws and Kirschner wire for Dubberley type B capitellum fractures. [Methods] A retrospective study was done on 13 patients who received surgical treatment for Dub- berley type B capitellum fractures in our hospital from March 2016 to August 2019. All patients underwent open reduction and internal fixa- tion with mini plate combined countersunk screws and Kirshner wires through lateral approach. The clinical and imaging consequences were observed. [Results] All the patients had operation completed successfully without serious iatrogenic injuries, and followed up for (17.5±2.7) months on an average with time to resume full weight activity of the affected limb of (15.3±1.6) weeks. The VAS score decreased significantly (P＜0.05), whereas elbow extension-flexion ROM and MEPS scores significantly increased in all the 13 patients (P＜0.05). Post- operative images showed anatomical reduction in 12 cases, and displacement less than 2 mm without angulation or rotation in one case. At latest follow-up, all patients achieved fracture healing without further displacement of bone fragment, whereas 2 patients had mild osteoar- thritis, and one patient had heterotopic ossification. [Conclusion] Mini plate combined with countersunk screw and Kirschner wires does ef- fectively fix Dubberley type B humeral capitellum fracture.