Abstract: The array-design and beam-forming method for torpedo automatic target recognition and intelligent precise guidance based on preformed dense beams and underwater acoustic imaging is investigated. Aiming at the characteristics of torpedo application, such as small aperture, limited space and hardware scale, etc., an unequal array and a beam-forming method based on the complex array are proposed. Compared with the traditional equivalent uniform linear array model of torpedo homing system, this method improves beam patterns, and enhances the azimuth resolution within the same limit of array aperture. Simultaneously, under the same condition of beam configuration, the elements of the array and the signal processing channels of the system are greatly reduced. Accordingly, the essential aperture of array and hardware required can also be reduced. Simulation results verify the validity and feasibility of this proposed method.