The seabed dynamic environmental monitoring system is an important subject of the ocean observatory testing system in the South China Sea. On the basis of the ocean observing network built during the "Eleventh Five-Year Plan" period, the stability and reliability of the system have been improved, with a series of subsystems designed and applied, including the CAN field bus communication, ARM dual redundancy backup, Modem acoustic gateway, DC/DC parallel redundancy and backup battery. It mainly carries the acoustic Doppler current profiler (ADCP), CTD developed by the National Ocean Technology Center and high-precision pressure sensors, and integrates the shore-based monitoring and feedback subsystem, control and data acquisition subsystem, and communication and power management subsystem, achieving long-term real-time stable monitoring on the bottom boundary velocity profile, turbulent velocity field, temperature, salinity, pressure and other ocean dynamic factors. Through experiments and testing, the system is proved both stable and reliable, and conducive to the expansion and integration of sensors, which provides a reliable verification and observation node for the seabed observing network.%海底动力环境监测系统是南海海底观测网试验系统的重要课题。在“十一五”观测网的基础上，对系统的稳定性与可靠性进行改进，设计使用CAN现场总线通信、ARM双冗余备份、Modem声学网关通道、DC/DC并联冗余与备份电池。该系统主要搭载声学多普勒流速剖面仪(ADCP)、国家海洋技术中心温盐深测量仪(CTD)、高精度压力传感器等设备，集成岸基监测与反馈子系统、控制与数据采集子系统、通信与电源管理子系统，实现了对海底边界层速度剖面场、湍流速度、温度、盐度、压力等海洋动力要素的长期实时稳定监测。经过试验测试，该系统稳定可靠，利于传感器扩展集成，为海底观测网提供了可靠的验证观测节点。
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