The Hanbury BrownTwiss(HBT) interference has ultrasensitive performance in optical measurement, while the sound wave has the same characteristics as light wave,thus,the principle also has good positioning performance in sound source positioning.In view of the existence of redundant array elements in the array topological structure,a research on the topological structure of sensing array based on sound field HBT interference positioning method has been carried out in this paper, and optimized the number of array elements to reduce the number of array elements without affecting the positioning accuracy.By coding the 8element Larray topology and simulating all the possible topological structures,it is found that the positioning error of the four fourelement topological structures are no more than that of the 8element Larray. Finally, the optimized array topologies have been further verified through experiments,and the experimental results show that the fourelement topology structure of 00101011 has the best positioning performance with an error of 1.26%,which is consistent with the positioning results of the 8element Larray.The experiment verifies the feasibility and effectiveness of the array topology optimization.