Objective To develop the three-dimensional (3D) finite element (FE) models of pelvis and fracture fixation, and test their validity. Methods Based on CT scan images, the 3D FE model of the pelvis was built by software of Mimics, ANSYS ICEM, Hypermesh and ABAQUS. A uniformly distributed load of 600 N was applied in vertical direction on the upper lamina of S1 vertebrae to simulate the stresses on the pelvis in standing position and to verify the validity of the pelvis model. T-shaped acetabular fracture models with 3 types of fixation were also established to verify the validity of internal fixation. ResultsBoth the stress and displacement distributions were found to be bilaterally symmetrical on the pelvis in standing position, with the Von Mises stresses mainly distributed in the beginning of arcuate line, pubic branch and posterior-superior area of acetabulum. The largest displacement occurred in the center of the sacral crest, and became relatively smaller in iliac fossa and femur, which was reduced gradually to the femur. Each of the three fixation types in acetabulum showed good biomechanical stability. Conclusions The established hexahedral grid-3D FE model can accurately simulate mechanical properties of the femur in standing position, which would provide an intuitive basis for clinical study.