Abstract: In response to the problem of meshing interference between the actual radial deformation of the flexspline and the linear assumed deformation during the harmonic transmission process,a finite element model of the harmonic gear transmission is established in Ansys Workbench with the non common tangent double arc tooth profile as the research object, and the radial displacement of the long and short axes of the flexspline is extracted. Based on the principle of double arc tooth profile modification and Matlab parameterized programming, the three-dimensional modification of the flexspline tooth profile is carried out, perform finite element analysis on the simulated solid model. The results show that all sections of the modified flexible wheel designed by the finite element method can achieve interference free meshing. The maximum equivalent stress value of the modified flexible wheel designed by the finite element method is 41.79% lower than that of the unmodified one, and 14.65% lower than that of the linear method. The stress distribution of the modified flexible wheel designed by the finite element method is more uniform.