Abstract: In this paper,an underwater target simulator is designed for wideband and multi-target model based on the PXI bus in LabWindows/CVI.The simulator generates 24-channel analog signals of an under-water acoustic planar array,which can simulate signal target echo,reverberation,and environmental noise in a laboratory marine environment.The simulator provides various target information for test of under-water acoustic devices.Application in developing and testing an underwater acoustic homing system is presented.