Abstract. Inner damage of grain influences technological quality and reproductive ability of wheat. The study conducted so far points out to the fact that the primary reason for inner damage is, most often, high moisture gradient which may be present in the process of steeping. The analysis concerned mechanical damage resulting from intensive wetting of dry wheat grain at high relative humidity. Roentgenographic detection method was applied in order to determine the location and the number of cracks. The experiments conducted have proved the extend of endosperm destruction to be influenced by both its moisture content humidity and its texture type as well as kernel size.