Abstract: The article described automatic control of water parameters in recirculating aquaculture system, including decentralized control, centralized management, remote monitoring model, discussed some recirculating water treatment process, utilized equipment and controlling parameters. Based on control requirement, different control strategies were adopted. PID control was used in pH, ozone concentration, dissolved oxygen and Fuzzy -PID self -tuning control was selected in temperature. Meanwhile, this paper expressed the overall structure of automatic system and the configuration monitoring of system architecture.