Abstract: Taken the areas of Dongguashan copper mine ventilation system as an engineering background，combined with self-developed Ethernet-DCON control unit，the DCON remote I/O control units and monitoring system software，the computer network communication technology，the fan frequency conversion control technology，as well as underground airflow and environmental parameters monitoring technology were applied，the fans of multistage fan station at all levels (including the fan start and stop and reversing control，frequency conversion control，operational status and parameters monitoring，etc.) were remote centralized monitoring. And the airflow parameters (airflow velocity and air flow volume) in main ventilation tunnels，underground atmospheric environmental parameters (temperature，humidity，concentration of O₂，NO₂ and CO) were automatic and continuous monitoring.

Key words: Computer network communication, Fan frequency conversion control, Environmental parameters monitoring, Ethernet-DCON control unit, Remote DCON I/O control units