Abstract: In order to improve the positioning accuracy of twin-line array focused beamforming when the number of elements is small or the frequency is low, a passive positioning method for twin-line array based on deconvolved focused beamforming is studied in this paper. In this method, spherical wave compensation is performed on the received signal of the twin-line array in the measurement area, and then the acoustic image of the noise source distribution is given. According to the parameters of the array, the directivity function of the twin-line array is calculated. Finally, a two-dimensional extended R-L deconvolution algorithm suitable for shift-variant array is used to deconvolve the output of the acoustic beam and the directivity function, and the source distribution based on the deconvolved focused beamforming is solved. This method has lower side lobes and higher resolution, which effectively improves the positioning accuracy and the resolution of port/starboard ambiguity and provides a reference for noise and vibration reduction, noise detection and other research work.