Abstract: Objective: Compared to conventional asynchronous motors, the DPM (directdrive permanent magnet) transmission eliminates the need for gear transmission device, improving transmission efficiency, reducing maintenance workload on transmission mechanisms, and enhancing the overall efficiency of the transmission system. To address the issue of increased vibration during lowspeed operation of DPM traction motors, it is aimed to improve the service life, safety, and comfort of these motors from conducting this specific research. Method: Focusing on the intensified vibrations observed in the 90 to 105 r/min rotation speed range of DPM traction motors, according to the vibration mechanism of permanent magnetic motors, an analytical approach is employed to investigate the numerical relationship between slot matching in the motor poles and the motor radial electromagnetic force of the DPM traction motor. The SKFAX data collector is utilized to measure vibration acceleration at the transmission and nontransmission ends of the DPM traction motor and in different directions. Spectral analysis is conducted on the vibration results to identify the frequency range causing the vibration. Finite element analysis is employed to analyze the radial force in the DPM traction motor and assess the modal characteristics of the stator core, obtaining the amplitude, frequency, and natural frequency of the stator core. Result & Conclusion: The combined use of analytical method, vibration detection tests, and finite element simulation analysis demonstrates that resonance in the 90 to 105 r/min rotation speed range is the root cause of the intensified vibration. Based on this analyses, the motor pole matching is improved by changing the configuration from 14pole, 114slot to 14pole, 126slot. Finite element simulation analysis and vibration detection tests confirm the effective resolution of resonance issue in the 90 to 105 r/m speed range, thereby enhancing the safety and comfort of DPM electric locomotives.