| Summary: | This paper aims to explain the main soil types (ordos) and their features, the factors affecting soil formation and development of the Lower Asi River basin. This part of aim benefited from various datas and different maps in various scales with literature. Subsequenlty, the field work has been done in the basin area and soil samples were collected and analyzed. The next step, all of these data converted into thematic maps and transferred to the text with techniques of Geographical Information Systems (GIS).Consequently, many factors that formation and development of soil in the basin area, especially to be climate, geomorphological features and base material, were found to be effective. In this regard soil type such as Alfisol, Andisol, Entisol, Histosol, İnceptisol, Mollisol and Vertisol, was understood in which distribution in the basin area. The most common types of soil determined to be Entisol and Inceptisol that in the youth or adolescence phase. The most common soil texture types are occur silty loam and clay loam in the basin area. This condition in general reflect the basin is dominated by heavy textured soils
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