Abstract: Underwater acoustic imaging and image guidance are the most effective ways to torpedo target recognition and intelligent precision guidance in modern complex underwater acoustic countermeasure of battlefield environment. In order to realize target image recognition and precise image guidance in torpedoes, aiming at torpedo applications, this study presented an acoustic imaging method with high azimuth and range resolutions by means of preformed dense nar-row beams and image signal processing of each narrow beam. A novel high frequency non-uniform sparse array and the beamforming method were put forward to generate dense narrow beams and achieve high azimuth resolution. And the algorithms of high range resolution imaging processing with wideband signal were proposed for each beam further processing and achieving high range resolution. Additionally, a method for target acoustic image optimization based on double thresholds segmentation and fuzzy clustering analysis was developed. Hence, target high resolution acoustic imaging was implemented with lower hardware complexity of the imaging system and convenience. Computer simula-tions and experiments indicate that the acoustic imaging scheme is effective to achieve target acoustic images with high azimuth and range resolutions.