[Objective] To compare the biomechanical characteristics of internal fixation of Dubberley type IIA humeral capitulum frac- ture with Kirschner wire (KW) , Herbert screw (HS) , mini plate (Mini plate) , mini plate plus Kirschner wire (MP-KW) , mini plate plus Her- bert screw (MP-HS) by finite element method. [Methods] After the CT image data of the right elbow in neutral position were collected from a volunteer, the Mimics and 3-matic software were used to establish a Dubberley type IIA humerus fracture model. On this basis, KW, HS, MP, MP-KW and MP-HS fixation models were established, respectively. As loads were added in ANSYS software, the displacement of frac- ture ends and the stress distributed on the implant of internal fixation were analyzed. [Results] The displacement of fracture ends was ranked up-down as KW＞HS＞MP-KW＞MP-HS [(2.7±0.1) mm, (0.7±0.0) mm, (0.4±0.0) mm, (0.2±0.0) mm, P＜0.05] under straight extension load- ing, while KW＞HS＞MP-KW＞MP-HS [(2.0±0.0) mm, (0.6±0.0) mm, (0.3±0.0) mm, (0.2±0.0) mm, P＜0.05] under flexion loading, and KW＞ MP-KW＞HS＞MP-HS [(2.0±0.0) mm, (1.1±0.0) mm, (0.8±0.0) mm, (0.6±0.0) mm, P＜0.05] under torsion loading. In addition, the Von-Mis- es stress on the implant at fracture line was ranked up-down as KW＞HS＞MP-KW＞MP-HS [(8 478.5±30.1) MPa, (1 790.3±33.8) MPa, (1 173.4±32.7) MPa, (645.3±3.5) MPa, P＜0.05] under straight extension loading, whereas KW＞HS＞MP-KW＞MP-HS [(4 540.2±60.0) MPa, (1 331.9±6.5) MPa, (824.8±4.9) MPa, (450.9±2.7) MPa, P＜0.05] under flexion loading, and KW＞MP-KW＞HS＞MP-HS [(6 260.38±39.6) MPa, (2 786.6±4.0) MPa, (1 141.0±35.7) MPa, (1 050.9±26.6) MPa, P＜0.05] under torsion loading. [Conclusion] For Dubberley type IIA humeral capitulum fracture, mini plates plus Herbert screws provide better biomechanical stability, which might give a better healing envi- ronment for the fracture.