Abstract: Objectives This study aims to develop a novel noise reduction method for pump-jet propulsors based on porous medium. By replacing the leading edges of the stator blades with porous material, the interference between the blade wake and the inner wall of the duct can be effectively modulated, thereby reducing wall pressure fluctuations and suppressing hydrodynamic noise generation at the source. Methods Large eddy simulation (LES) combined with acoustic analogy analysis was employed to investigate flow and noise control using stator blade leading edges made of porous medium. The study focuses on elucidating the modulation mechanisms of porous medium on the flow field, evaluating the noise reduction performance, and exploring the influence of porosity and advance coefficient on control effectiveness. Results The results show that the porous leading edges on the stator effectively reduce low-frequency sound pressure level components on the duct wall, significantly suppressing far-field radiation noise from the wall. As a result, the maximum sound pressure level in the direction perpendicular to the rotation axis is reduced by up to 5.52 dB. Conclusions This study confirms the effectiveness of porous medium in controlling flow and hydrodynamic noise in pump-jet propulsors and demonstrates the promising potential of this technology for applications in marine engineering.