The development of equipment for energy saving grain drying is not losing its relevance. For its effective implementation it is reasonable to apply the most promising solutions in electrotechnologies, such as the use of air ions. The article describes the receiving the model describing application of electroactivated air. To obtain the sought for model, the foundations of similarity theory, as well as the dimensional method were used. The electroactivation coefficient introduced to consider air ions influence in drying process, was described. In the result, the mathematical model has been obtained, that can be used both in the description of drying process and optimization of drying equipment parameters to intensify drying process. The results of experiments of grain drying with use of the electro-activated air are given in the article and the possibility of optimization of drying process is described.