In order to solve the problem that the deformation of scroll is difficult to be measured by experiment,and the meshing clearance between the scrolls is difficult to be determined,a three-dimensional fluid domain model of scroll with axial and radial leakage clearance was established.The CFD dynamic mesh technology was used to simulate the fluid field inside the scroll,and the transient distributions of the pressure field and temperature field inside the scroll were obtained.By applying the calculated results of flow field to the solid as boundary conditions,the stress and deformation distributions of the scroll were obtained.Taking into account the whole deformation of the scroll tooth and the bottom plate,the calculated results of solid deformation were closer to the actual working situation.Then the accuracy of the simulation was verified by comparing with experiment.The stress and deformation of the orbiting scroll under the action of only air force,only temperature and thermomechanical coupled field were compared and analyzed.It is concluded that the temperature rise is the main reason for the deformation of the scroll.According to the above analysis results,an improved scroll structure was proposed.The deformation and stress distribution of the improved scroll were simulated by the above method.The results show that the stress and deformation of the improved scroll are reduced,which provides reference for improving of the scroll structure.