Abstract: Aiming at analyzing the rotor stress of surface-mounted high-speed permanent magnet motor with a carbon fiber sleeve under the influence of temperature rise and other factors, the rotor structure was simplified as the interference fit of two thick-walled cylindrical sleeves firstly. Then, the stress analytical solution of permanent magnet rotor retained by a carbon fiber sleeve was proposed based on the plane stress model of rotor and the elastic theory, considering the effects of interference, rotation speed and temperature. Subsequently, the analytical solution was verified by the finite element method. Finally, based on the proposed analytical solution, the influences of the parameters, such as the interference, rotation speed, temperature and sleeve thickness, etc., on the rotor stress were further studied. The results show that the calculation results of the analytical method proposed are consistent with those of the finite element method, and the analytical solution can accurately calculate the rotor stress of the surface-mounted high-speed permanent magnet motor with a carbon fiber sleeve. The interference, rotation speed and temperature rise have a significant impact on the rotor stress, while the sleeve thickness have a relatively small impact.