Objective To investigate the effect of abductor load to the femoral head in the Chiari pelvic osteotomy by biomechanics. Methods The three-dimensional finite element hip models of Chiari pelvic osteotomy was constituted to observe the regularity of stress distribution according different abductor loads using the nonlinear contact analysis. Results It was found that the contact pressure and the peak stress after Chiari pelvic osteotomy decreased remarkably, but the contact area increased clearly. With the decreasing of the abductor loads, contact pressure and peak stress decreased correspondingly. And the contact pressure distribution transferred from the original acetabular area (pressure turning into low) to the new acetabular area (pressure turning into high) gradually. But the changes of the contact area were not significant after Chiari pelvic osteotomy corresponding to different abductor loads. Conclusion The biomechanics changes owing to abductor load plays an important role in Chiari pelvic osteotomy.