Abstract: In order to study the factors affecting the ignition risk parameters of pulverized coal cloud, Godbert-Greenwald constant temperature furnace was used to test the minimum ignition temperature of pulverized coal cloud under different particle size, mass concentration and powder injection pressure conditions. The results show that the minimum ignition temperature increases with the increase of particle size. In the range of 0.250−0.667 kg/m³, the mass concentration of pulverized coal decreases with the increase of mass fraction, and the minimum value is 545 ℃. With the increase of dusting pressure, it changes in the shape of “V”. The degree of influence of the three factors on the minimum ignition temperature is as follows: mass fraction > powder injection pressure > coal particle size.