In　this　paper,　an　accurate　triangular　spectral　element　method　for　prediction　of　aerodynamic　noise　is　established.　Combining　with　characteristic-based　split　method,　Navier-Stokes　equations　are　solved　to　obtain　the　acoustic　source　of　pseudo　acoustic　pressure.　Then　acoustic　propagation　problem　is　solved　based　on　wave　equation.　The　spectral　convergence　feature　of　spectral　element　method　meets　the　requirement　of　high　accuracy　in　aeroacoustic　problems,　while　the　introduction　of　CBS　method　guarantees　the　numerical　stability　in　high　Reynolds　number　problems.　The　effectiveness　of　the　proposed　method　is　demonstrated　by　two　benchmark　problems.　The　proposed　method　is　applied　to　calculation　of　plane　cascade　aerodynamic　noise.　Changing　law　of　noises　under　different　angles　of　attack　is　investigated.　The　research　content　provides　a　new　solution　for　further　investigation　in　aerodynamic　noises　of　various　type　of　fluid　mechinary.　©　2021,　Science　Press.　All　right　reserved.