Assisted atomization consists in destabilizing a liquid jet and breaking it up into droplets with the help of a fast co-axial gas stream. The mechanisms responsible for the liquid jet break-up have been widely studied but only partially understood, especially in the case when aqueous surfactant solutions are used. The surface tension of the liquid jet and droplets varies as surfactants migrate to the interface. The role of surfactants on atomization spray produced by a coaxial injector has been examined in this study. Three surfactants of different adsorption properties have been used. Images obtained by high-speed camera show that the surfactants with fast adsorption kinetics may reduce quickly the surface tension of the liquid jet before its breakup, therefore changes it’s dynamics. The measurements realized by Laser diffraction technique show that surfactants not only lead to a small decrease of the mean droplet size, but also modified the droplet size distributions of spray.