Abstract: The calculation formula of cascade broadband acoustic power was introduced and derived.Through this formula,the broadband sound power level of the subsonic axial fan with swept stator blade was predicted,and the influence of swept angle on stator radiated noise was explained.On this base,considering the actual fan's stator working in the rotor wake,the rotor wake turbulence wave spectrum model was established with Gauss wake model,and the broadband acoustic power calculation formula of the interaction between stator and rotor was derived.Compared with the NASA fan experimental model,it could be obtained that the improved calculation formula could better predict the stator broadband sound power.For the experimental model,the influence of stagger angle and chord to broadband noise of stator with swept blade was analyzed at last.