Abstract: Cabin noise affects the comfort of passengers in aircraft, and noise is one of the important factors affecting the airworthiness certificate and market acceptance of civil aircraft. Numerical prediction methods for high-frequency acoustic loads on fuselage play a crucial role in the development of aircraft low-noise design. The area projection beam-tracing method for the acoustic pressure prediction on fuselage can solve the inadaptability of using classical geometric acoustic method for calculation in large space. The classical ray-tracing method has strict requirements on the receiving cells under different spaces. In this paper, the cell grid of the fuselage model is taken as a single receiving cell of the model, and the projection of the receiving cell onto the sound source envelope surface determines the acoustic energy density that the receiving cell should receive. By comparing the calculation results with the classical algorithm under the standard model, the advantages and disadvantages of the improved method and the classical method in terms of calculation results and calculation efficiency are quantitatively analyzed. The accuracy of the improved method is verified by comparing the calculation results of acoustic ray-tracing method module of commercial software under the aircraft model.