Abstract: The expansion of the underground mining capacity and the mining at an increasing depth in Hongtoushan Copper Mine have brought the problems of long ventilation route, great ventilation resistance, many working faces and insufficient air flow rate, leading to a deteriorated environment at the working face. A plan for transforming its east ventilation system was put forward. Testing was carried out on the mine's ventilation system. Based on the testing results, graphic method was used to compute and analyze the feasibility of this transformation plan and the measures for reducing the resistance of the east ventilation system were proposed.

Key words: Ventilation system, Air flow rate, Ventilation resistance