Abstract: Underwater target recognition is discussed under the condition of abeam bearing attacking, and the attacking angle on the bow is increased. According to the shape of array, space source numbers, which stand for space highlight numbers,can be estimated. Submarine space feature are found and extracted.A new method based on the space source number under certain SNR condition is presented for cross attack issue of underwater target recognition, and the automatic classification of target features on the basis of certain SNR and radius of Gael circle is studied.Simulations show that this method is valid under various conditions.