Cavity aerodynamic noise problem has important application in the field of aviation, and its methods and applied research is of great social significance and economic benefits. Nonlinear acoustic solver (NLAS)is used in order to predict the near-field cavity noise. The calculated results are in good agreement with the experimental data, which proves the rationality of this method. In addition, in order to suppress the cavity noise and improve the environment for the cavity flow field, other three kinds of different structure are taken. The result shows: the trailing edge slope most conducive to reduce noise, reduce about 5db. The results of the cavity have certain reference significance for engineering applications.

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