In order to investigate the characteristic of properties of the disc atomizer, the experimental and computational simulation methods were adopted. The optimum working rotational speed and the air velocity field at different rotational speeds of the disc atomizer were studied and validated by the experiment data. The results showed that the optimum rotational speed was 1400r/min at the selected impeller. The velocity field of the disc atomizer was axial symmetry. The velocity of central plane diffused at a fixed angle and decayed along the centre line. The simulation data was closely related to the experiment data.