Single kernels of wheat grain (Kamila, Kobra and Roma varieties) were subjected to dynamic loading in the laboratory conditions. The grain samples were moistened and then dried using the three following methods: room temperature drying, drying in a dryer with the controlled air flow – with and without microwave assisted drying. The grains that had not been moistened were used as u control sample. The increase in the state of internal cracks of endosperm (micro-damage) and the number of crumbled grains (macro-damage), as a result of the applied loads, were subject to a careful assessment. The state of the grain micro-damage, expressed using the damage index, was assessed before and after applying the loads using the system for computer analysis of the X-ray images. It was determined that the applied methods of drying had the influence on the state of grain destruction as a result of loading. The macro-damage was affected mostly by higher temperature of drying. The micro-damage was affected mainly by grain moistening, independently of the later applied drying method. However the grains dried using the microwave assisted drying had the highest increase in cracks. A significant influence on grain crumbling had also its previous state of cracking.