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¹ Ankara Üniversitesi, Ziraat Fakültesi, Tarla Bitkileri Bölümü - Ankara - This study was carried out to determine plant inferior variation in terms of accumulation of ail and protein and how position effect can change chemical of seed in some soybean cultivars (Williams, AP-350, A-3127 and Corsoy) under Ankara conditions in 1997. The samples were ensured from soybean cultivars reached to harvest maturity. These plants were divided to three parts and these parts were called as bottom, center and top. Besides, twelve pods per plant were broken from various portions of plant and it was regarded that each pod had content. In addition, it was determined that the protein content in pod declined from basal to tip three seeds. Three seeds were also described as tip, middle and basal of pod. Later, protein and oil content of the seeds in the different pods on the plant and at the various portions of pod were determined. Protein and oil ratio were determined at Department of Field Crops analysis lab, Faculty of Agriculture, University of Ankara. According to the results; it was observed that accumulation of oil and protein may vary position of pod on the plant, position of the seed in the pod in all cultivars. It was determined to decline oil content from bottom to the top, in contrast to increase protein while oil content increased in all cultivars. Keywords : Soybean, oil, protein, variation