Abstract: The characteristics of dust dispersion such as whether the dust is evenly separated without any aggregation play on a significant role on the measurement accuracy of explosion parameters characteristics of dust dispersion in the 1.2 liters Hartmann bomb, in the 20 liters spheres and in the sieving tube with vibration were investigated respectively, by means of microscope and special sampling technique together. The results indicate that the best dispersion quality takes place in the 20 liters sphere dust, the dispersion quality in Hartmann bomb is the second and the quality in sieving tube with vibration stays at the end. In the case of the sieving tube with vibration, a lot of dust particles are aggregated with each other. Therefore, the sieving tube with vibration is not suitable to be used to measure the minimum ignition energy of dust explosion parameters.