This project is chaired by Prof. Chen Yaowu from BME, which wins the first prize of Award for Technology Invention in Zhejiang Province in 2015. They proposed the method of constructing sparse transducer array suitable for both near field and far field, invented the distributed sub-array real-time beamforming algorithm and the method of dynamic 3D image reconstructing, invented the parallel processing system architecture based on large scale FPGA, and finally developed high resolution phased-array 3D imaging sonar successfully.