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This paper focuses on the harmonic suppression function of the damper windings for air-gap magnetic field of line-start permanent magnet synchronous motors(LSPMSM) using finite element analysis (FEA). The Squirrel-cage bars damping function of LSPMSM not only reduces effectively the air-gap density harmonic components, but also enhances the starting performance of LSPMSM. The harmonic components of air-gap magnetic field is mainly caused by the special rotor structure and excitation method of LSPMSM. Therefore, the simulations and the tests for the line-start PMSM designed by the author were compared, and the results shown in this paper have confirmed the validity of harmonic suppression function of the damper windings; and it is practical value for the reasonable design of line-start PMSM.