This paper introduces an aquaculture multi-parameter monitoring system. The hardware structure of the system is introduced, the software design of the system is described in detail and the flow charts of the key functions are presented. By using the Profibus-DP field bus, more monitoring stations are joined together to constitute a distributed monitoring and controlling network, which has functions like accurate signal collecting, real-time signal analyzing and processing and automatic alarm. The system can not only improve the accuracy and stability of parameter monitoring, but also enlarge the monitoring range, convenient the water environment monitoring and managing, reduce the cost of equipment and production. It can apply to the large aquaculture enterprises.