Abstract: Along with the increase of mining depth，energy consumption on mine ventilation system is increasing.How to supply air to deep mine economically is one of the important issues faced by the underground deep mining.For this deep mining，the controlled recirculating airflow technique was adopted to realize the energy-saving air supplement.Taking Fushun Hongtoushan Mine in Liaoning for instance，and based on purification experiment of harmful gas among air return，the air purification plant，the harmful gas monitoring device，and some sealing and electronically controlled throttle were set at -287 m level of Hongtoushan Mine to form controlled recirculating air.The airflow quality monitoring system in Hongtoushan showed that mixing airflow quality conformed to the relevant state regulations.And according to the theoretical calculation of recirculating air mixing proportion and energy consumption，energy consumption can be reduced by 32.1% in minimum with controlled recirculating air system in Hongtoushan Iron Mine.In winter，this system can be used to preheat fresh entrant air to prevent shaft frozen and save energy.

Key words: Metal mine, Deep mining, Mine ventilation, Controlled recirculating air, Circulation air purification