Abstract: In a closed wind tunnel for acoustic measurement,the layout of acoustic sensors needs to be optimized according to the existed openings on the wall for the best image results.For common sound sources and existed openings on the wall of the wind tunnel,three kinds of array layout methods are proposed in this paper,they are different aperture matching,ellipse and ‘windows’ types.The mentioned methods not only meet the existing opening needs,but also solve some thorny problems,as regular array design does not match the wind tunnel openings,array performance cannot reach optimum,and even sensor array cannot work.Through the special array shape design and imaging results comparison,the general factors affecting beamforming results and quality judgements of the array are obtained.The simulation results show that the proposed methods have strong adaptability and the beamforming results have high resolution,which can effectively suppress side lobes and improve dynamic range.