Objective The three-dimensional finite element model of PFNA internal fixation of intertrochanteric fracture of femur was established to provide a research basis for the mechanical study of intertrochanteric fracture of femur.Methods Based on the CT data of the study object, the three-dimensional finite element model of PFNA internal fixation of intertrochanteric fracture of femur was established by applying digital three-dimensional reconstruction, CAD, reverse engineering, finite element biomechanical analysis and other technologies, and the effectiveness of the model was verified.Results A three-dimensional finite element model for PFNA internal fixation of intertrochanteric fracture of femur in normal people was established. The model established in this study has practical value and can be used for the mechanical study of femur.Conclusion The three-dimensional finite element model of PFNA internal fixation for intertrochanteric fracture established in this study fully considers the mechanical effects of cartilage, ligament, muscle, stress contact point, etc., on femur. The model is closer to the actual human body, and the mechanical research results are more significant for reference.