Abstract: In order to change the shortcomings of traditional tailings reservoir management and con⁃ trol，such as high labor intensity，inability to predict potential dangers in advance，and timely early warning and handling of problems，a tailings reservoir safety early warning system based on remote network DCS is proposed. Firstly，the macro control architecture of remote network DCS of tailings reservoir is de signed，which includes perception layer，aggregation layer，service layer and application layer. Then，the hardware and software function design of each layer is introduced in detail，and the PLC program design of DCS aggregation layer and the software design of remote network application layer are mainly discussed. Finally，the structure of early warning and diagnosis expert system for tailings reservoir is explained in detail. The practice shows that the system greatly reduces the labor intensity and maintenance cost of workers pa trolling metal tailings pond，improves the safety monitoring and management level of tailings reservoir，and has good demonstration and application value.

Key words: tailings reservoir, safety warning, remote network, DCS