Abstract: Problems existed in ventilation system of Hemushan iron mine currently were analyzed according to the measured results of underground ventilation parameters,total air volume and total ventilation resistance of mine were calculated,optimizated plan of ventilation system was initially defined and 3-d ventilation network simulation calculation were done. Operation of fan and inverter of air station at -150 m were stable after the plan implemented,expected ventilation effect has reached.

Key words: Ventilation system optimization, Frequency control, Simulation calculation