Four pedons of Alfisols were selected from the Experimental Station Mochełek to study chemical composition of the soil material. The study area is located in the south-western border of the Krajeńska Upland, on the border of two geomorphological formations: erosion surface of floating waters (fluviglacial formation) and rolling ground moraine (glacial material). The investigated soils were classified as Typical Hapludalfs (pedon 11, 21 and 26) and Typical Glossudalfs (pedon 7). Chemical composition was analysed using the following methods: fusion with Na₂CO₃ and dissolving in the HF and HClO₄ mixture. Results were presented in an oxide form and molar ratios (SiO₂/R₂O₃; SiO₂/ALO₃; SiO₂/Fe₂O₃; Al₂O₃/Fe₂O₃) were calculated. In the studied soils, the content of SiO₂ was from 78.21 to 90.00%. The lowest SiO₂ content was found in the illuvial horizons. Otherwise the illuvial process influenced Al₂O₃ and Fe₂O₃ distribution, the highest amounts of which were found in the illuvial horizons. TiO₂ (0.15 to 0.63%), had similar profile distribution to K₂O (1.74-3.88%) and Na₂O (0.61-1.05%). CaO and MgO contents were the highest in the parent material, including CaCO₃ (pedon 11 and 26). However, the highest amount of MnO was observed in the surface horizons (0.56-0.58%). Chemical composition of the studied soil material indicated a large influence of the illuvial process and particle-size on the total content and pro tile distribution of the analysed soil. However, the evident influence of parent material from which the analysed soils were formed, was not found.