Abstract: The Texas Instruments′ Incorporated′s TMS320VC5409 DSP is used to design the hardware of a data processing system for dipping sonar. By using three McBSPs on a chip as data paths between multi-processors,we construct the a brief and stable structure of the hardware system with good expansibility and universality is constructed. Simultaneously,throughput and processing ability of this system are increased greatly by the use of DMA technique,which transmits or receives data without intervention caused by the CPU. Furthermore,the design idea is coincident with the modern hardware development,and the system can accommodate most of dipping sonar processing instances for dipping sonar.