Abstract: The dust concentration and velocity of turbulence have significant effects on the level of explosion and measurement of the minimum ignition energy of dust clouds. The research conducted a measurement study on the dust concentration in a 1.2L Hartmann Bomb, analyzed the measurement data, and finally obtained the time-dependent curves of dust concentration at different heights in a 1.2L Hartmann Bomb. The dust concentration along heights in the Hartmann Bomb distributes ununiformly. For a given position height of the electrode in the Hartmann Bomb and the ignition delay time of 170 ms, when the calculated concentration is 500 g/m, the measured concentration equates approximately to the calculated concentration; when the calculated concentration is lower than 500 g/m³, the measured concentration is higher than the calculated concentration, and vice versa. The obtaining of the distribution of dust concentration along the heights in the Hartmann Bomb provides both the data for the comparison of the measurement and test of the minimum ignition energy at different equipment and the supporting evidences for the verification of the mathematical model of dust explosion.