Abstract: The change of force transmission caused by temperature deformation is more significant than that of a large-sized factory volute in pumped storage power stations because of the relatively small diameter. Taking a pumped storage power station as an example,the influence of temperature deformation on the gap and force transmission between the spiral case and the surrounding concrete is analyzed by the numerical simulation for the temperature field and temperature stress during the construction and operation process. The research shows that the average force transmission between winter and summer is quite different. Compared with the design pressure transfer ratio when the temperature effect is seldom considered,the pressure transferred to the concrete during the summer operation period increases significantly which will cause the actual force of the concrete to be more than the design value and increase the risk of concrete cracking. In the structural design,the specific conditions of the actual project and the influence of temperature load should be considered in combination. The reasonable bearing ratio of the volute and its surrounding concrete should be obtained through the three-dimensional finite element simulation analysis that simulates the construction and operation process.