Abstract: A two-dimensional bright spot image of an underwater target is obtained by simulating a multi-beam system.The transfer function of underwater target is calculated using the near-field planar element method of small bistatic angle and bistatic echo characteristics.Based on the theory of multi-beam system,a basic frame of 2D image of bright spots of underwater target is built,and simulation performed.Near-field 2D acoustic images of bright spots of underwater target under different azimuth angles are obtained.