Based on the RANS (Renolds Averaged Navier-Stokes) results of aerodynamic characteristics, SNGR (Stochastic Noise Generation and Radiation) method is utilized to fast evaluate the aeroacoustic effects of slat cove seals. The numerical method is first validated by wind tunnel test data of the 30P30N three-element airfoil. Then the aerodynamic and aeroacoustic performances are compared for the no seal configuration, the short seal configuration as well as the long seal configuration. Numerical results show: 1) the short/long seal brings no inferior influence on the stall angle of attack, and only 0.2%/0.7% correspongding loss of lift coefficients; 2) the lift loss are due to the lift coefficient distribution changes on the upper and lower surfaces of the seal, as well as on the lower leading edge of the main wing, all of which comes from the seals’ influences on the shape of the vortex in the slat cove;3) compared to the no seal configuration, the self noise, the shear noise and the total noise in the vicinity of slat, are reduced by both the short seal and the long seal, especially the long seal.