Abstract：In the complex ventilation network, there are such problems such as large mine resistance, unreasonable resistance distribution, fan performance curve staying in the unstable working zone, etc. The way of paralleled adding return airway was used. The mine ventilation network was analyzed, and the results showed that under the conditions of unchanging mine ventilation way, adding reasonable return airways had lower production cost, obvious ventilation resistance reduction and convenient mine ventilation management. Taking the resistance-reduction and optimization of the ventilation network in Jiaojiazhai mine as an example, by adding reasonable return-airways, the situation of mine ventilation could be improved greatly. The conclusions could provide references for mine resistance-reduction of complex ventilation network.

Keyword：complex ventilation network;network resolution;resistance-reduction optimization;paralleled return-airway;