The ventilation system in coal mines is the most important subsystem in underground production,and ensuring its optimal operation is of great significance.Firstly,this paper introduced the purpose of optimizing mine ventilation systems,which is to ensure the efficiency of mine ventilation and the safety of mine ventilation;Then,it analyzed the composition of the mine ventilation system,mainly including ventilation network and ventilation facilities;Finally,it explored optimization measures for ventilation systems,including regular measurement of ventilation resistance,optimization of mine ventilation network,and reasonable distribution of air volume,which can provide certain technical references for the optimization of mine ventilation systems.