Abstract: Combined with the extending project practice of underground powerhouse at some hy-dropower stations,ANSYS is applied to numerical structure analysis of rock bolt crane girder,we take fully into consideration the effect caused by deformation of concre te,rock mass and anchor rod on rock bolt crane girder.Three-dimensional non-linear finite element method is applied to simulate and analyze the wheel load stress state of crane girder bolted to rock wall of ch amber during operation phase.Analyzing the effects of working situation and stability provides reference for the development of design theory and construction ways to rock bolt crane girder.