Abstract: A distributed measuring system of ventilator performance was used to measure performance of two main ventilators of west airshaft in Dongtan Coal Mine, and curves of blastvolume-air pressure, blastvolume-power and blastvolume-efficiency were drawn according to the measured data. Ventilation abilities of main standby ventilator in different condition and different blade angle were analyzed. The practical application showed that the system greatly reduces time needed for field testing and is effective and accurate in data processing.