Abstract: The status of the ventilation system of a gold mine in Shandong Province is investigated and evaluated,the problems such as unsufficient of mine overall air volume,lacking of ventilation shaft engineering and improper distribution of air volume of middle sections.In order to solve the above problems,the systematic optimization study of the ventilation system of the mine is done by using ventilation network optimization technique,machine station optimization technique and ventilation fan optimization and selection technique,and three ventilation system optimization schemes are proposed.By comparative analysis of the ventilation system optimization schemes,the scheme that is taking the ventilating shaft newly digged in 54# line,so as to form the single wing diagonal extraction ventilation pattern is selected as the optimal one.The threedimensional ventilation dynamic simulation software Ventsim is adopted to calculate the ventilation network optimized by the new scheme.The results show that after the optimization of the ventilation system,the overall air volume can be reached to 47.53 m3/s,the working efficiency of the main fan is 85％,the number of ventilation managers is decreased,the labor intensity of ventilation management is reduced,the labor productivity is improved,besides that,the ideal economic benefits can be obtained.

Key words: Mine ventilation, Optimization of ventilation network, Machine station optimization, Ventilation fan optimization and selection, Ventilation scheme