Abstract: According to characteristics of underwater acoustic image processing method on real-time sea measurement, several methods were proposed to overcome various disadvantage factors.These methods included system time delay error calibration,array lean angle amendment,depth measure and dividing frequency band target localization.The experiment validate of underwater acoustic image localization precision was made by two contrastive methods:underwater acoustic image result and GPS register value,abeam distance of underwater acoustic image result and abeam distance of GPS register value.By the experiment validate,underwater acoustic image is demonstrated to have better localization precision on shallow sea.The biggest abeam distance error reaches 2.9 m and mean reaches 0.93 m,consequently warship target localization with high resolution is realized.