The solubility index, dispersibility and wettability of yoghurt powder were affected by the outlet air temperature, but the trend of this effect could not be figured out clearly. The bulk, tapped and particle densities of yoghurt powder were 538, 746 and 1177 kg/m3, respectively. These values are an indication that yoghurt powder has fair porosity (36.54%). Yoghurt powders have moderate-poor flowability (CI = 27.93%) due to their small particle size (3.053 μm), and high caking degree (30.32%) values. The resultant powder is not very hygroscopic. With respect to morphology, the yoghurt powder particles were mostly spherical and showed a crater-like structure. For purposes of understanding the particle formation process, predicting product quality and evaluating the behaviour of spray-dried yoghurt powder during reconstitution, this information will provide a helpful approach