The acoustic directional transmission system can transmit acoustic signals with high directivity outward and has many applications in the fields of industry,medical treatment and military.As the most critical part of the system,the transducer array still has the disadvantages of high cost,low energy conversion efficiency and complex equipment structure.In this paper,the genetic algorithm is used to optimize the array layout and the effect of arrangement and amount of array elements on the array directivity is analyzed in detail to get the purpose of reducing the number of array elements and suppressing the sidelobe effectively.The simulation experiment shows that the array optimized by the genetic algorithm can use less array elements and obtain lower sidelobe,so that the energy is more concentrated in the main lobe direction.Therefore,the proposed method can reduce the complexity of the array design and manufacturing cost,and has certain reference value for the improvement of the audio directional transmission system.