In the field of aerodynamic noise, cavity noise is an important part, and acoustic liner. As an effective noise reduction measure, the principle of sound absorption is the principle of micro-perforated plate absorber, that is, multiple helmholtz resonators are connected in parallel to absorb sound energy by excitation resonance of the back cavity.The sound absorption was affected by various structure parameters of the lining. Aiming at the problem of aerodynamic noise in the low speed cavity, this paper makes a multi-parameter mix design of the sound liner through the principle of micro perforated plate sound absorber, and adds it to the cavity. The spectral characteristics of cavity noise before and after the installation with acoustic liner were compared, and the noise reduction effect of the sound liner in the cavity noise problem was evaluated. The influence of adding acoustic liner to the noise of the self-excited oscillation cavity and the effect of the acoustic resonance were analyzed.