Abstract: According to the laws of proportion,the mathematical translation method of fan characteristic curve is put forward.The characteristic curve of fan and angle of different blade are acquired quickly by measuring the fan performance curve or adopting the standard curve.The index system of mine ventilation operated safety and stability.This research results proved that ,variable fuzzy theory is used to analysis and evaluation the stability of the mine ventilation, to provide some basis for evaluating the stability of the mine ventilation system.

Key words: Mine ventilator, Safety and stability, Variable fuzzy theory, Lows of proportion