针对建德铜矿下部中段Ⅱ号矿体投入生产后井下通风困难的状况，全面分析了造成井下通风困难的主要原因，论述了矿井通风系统改造必须结合矿体赋存条件和生产布局，才能选择出行之有效的通风系统方案，取得通风效果良好、节能显著、适应生产发展需要的结果． In view of the difficulty of downhole ventilation after the No.2 ore body in the middle section of Jiande Copper Mine was put into production, this paper analyzes the main reasons for the difficulty in downhole ventilation and discusses the necessity of combining the occurrence and production layout of mine ventilation system with the mine ventilation system reconstruction Travel ventilation system effective program to obtain a good ventilation, energy-saving significantly, to adapt to the needs of the results of the development of production.