Abstract: The theory and its features of the grey relation projection with multi-objective decision-making are introduced and described. Taking wind pressure, equivalent orifice, feature ventilation airflow, annual power costs for air and fan acquisition expenses as the index set, the objective analysis and optimization on the possible design scheme of deep mining ventilation system in Yunxi Laochang Mine are made to get an optimal scheme. Then, the ventilation effect is improved obviously and costs are lowered after the implementation of the scheme. The practical application shows that the projection method is scientific, effective and feasible in optimization of mine ventilation system.

Key words: Multi-objective decision, Grey relation projection method, Mine ventilation, Scheme optimization