A submerged buoy system for ocean vector sound field measurement is designed with the three-dimensional vector sensor as a core.The submerged buoy is anchored in fixed place and depth in ocean which can be used in observing and recording the ocean vector sound field.The vector sound signals from vector sensor is pre-processed

sampled and recorded in the compact flash card with the FAT32 data format.The underwater gesture of submerged buoy is given by three-dimensional geomagnetism compass in real time.USB module of submerged buoy is used in transmitting data to PC after the submerged buoy system is got back.The sea trial results indicate the system can record the vector sound field information correctly and work for over 90 d continuously.