A b s t r a c t. Authors present results of studies carried out so far, based on the Grain Vulnerability Index (GVI) and the Particle Size Index (PSI) methods, using the simple tests as a static loading of the bulk grain. It was stated that the level of wheat grain damage increase when the wheat grain hardness decreases. Studies carried out to date indicate the necessity of including the level of wheat grain damage in the evalualion of the technological value of wheat.