Abstract: VentGIS, based on GDI + and GIS theory and developed from the ground, is a mine ventilation visual simulation system, which can create the topology relation automatically, make visual analysis, produce graph about ventilation. VentGIS can evaluate the current situation of ventilation system, and simulate and analyze ventilation system optimization and transformation. The ventilation simulation system of Xinzhi Coal Mine is constructed by VentGIS, the simulation result shows that it`s necessary to change the main fan in east area to meet the required airflow, and the ventilation system of 310 first mining area in south area should be optimized in order to decrease the ventilation resistance and made its distribution more reasonable.