Investigations in this thesis were carried out on 51 samples of conventional sunflower seed and 9 samples of oleic one, on 25 samples of soybean and 30 samples of rapeseed, all derived from sort trials in the crop season 2007. In seed itself, impurity content, mass of 1000 grains, moisture and oil content, as well protein content in soybean samples, was determined. For all raw materials the quality index was calculated. Corresponding oils were analysed for fatty acid composition and iodine value was calculated. Mass of 1000 grains of oleic type of sunflower was higher than of conventional one. Oil content on dry matter basis was lower (36 - 44 %) in oleic than in conventional sunflower seed (42 – 52 %). Soybean and sunflower had somewhat lower mass of 1000 grains then their commercial seed. Rapeseed had 39 – 48 %, and soybean 17 – 22 % oil on dry matter basis. Protein content (dry matter basis) in soybean was 39 – 45 % what is a guaranty for soybean meal of remarkable quality. In conventional sunflower oil, fatty acids and iodine value were within limits defined by law Regulation, and in oil from oleic sunflower seed, oleic acid content increased to 76 – 85 %. Fatty acid compostion of soybean oil varied from Regulation for almost every fatty acid. Rapeseed oils did not contain erucic acid and oleic acid increased to 59 – 73 %, what was, for some of them, over the upper limit included in Regulation. From nutritional point of view, according to the level of saturated, monounsaturated, ω - 3 and ω - 6 fatty acids, the oil of best quality is rapeseed oil.