The abrasion of granules based on herbal extracts processed in fluidized bed is theoretically analyzed. Formulas for determining the average particle size and the dispersion of the size distribution function are obtained. The influence of the main parameters of the abrasion process on the granulometric composition has been experimentally studied. The coefficient of abrasion intensity is determined.According to this expression, N (t ) = N 0 that implies that the number of granules remains unchanged, where 392 0091-150X/05/3907-0392