Abstract: In order to control the noise of a certain type of converter, the aerodynamic noise simulation research on this converter is carried out, and the result is compared with the tested results to verify the reliability of the simulation method and assist in the further diagnosis of the noise problem. The simulation results show that the aerodynamic noise source inside the cabinet is mainly concentrated in the area near the fan, and the discrete sound sources are caused by the rotation of fan blades. The spectrum of fan noise has peak values at the blade passing frequency and other harmonic frequencies. The simulation analysis of different noise reduction schemes is carried out, and the noise reduction effects of different materials and thickness schemes are compared and verified through experiments. The results show that the overall sound pressure level at the outlet is reduced by 12.2 dB(A) for the sound absorbing material scheme. The optimized amount of noise reduction obtained by simulation analysis is close to the tested result, and the simulation analysis method can be applied to the noise reduction design of subsequent new products.