Abstract: A combined Euler/Kirchhoff method is presented for predicting high-speed impulsive noise generated by a hovering rotor blade. Although lacking experimental verification. the results are promising. The results show that some benefit can be made by taking thin、sweep and taper blade-tip Shape in reducing the far-field noise. The modification is made. It is shown that the combined Euler/Kirchhoff scheme provides a powerful tool for engineering purposes.