abstract: It is very difficult to find soils that do not contain any anthropogenic additions, within urbanized area. Soils of the city of Lublin are subjected to various forms of anthropopressure. They are characterized by different degree of modification of their chemical, physicochemical, physical and biological properties as well as morphological constitution. The general aim of my dissertation was: to define, what of the soil properties and types of soil using determine the main role in the stopping, running and changing of the arsenic in the soil in the urban area. My additional aim was: to verify is specify of city's soils determines some changes in arsenic's behavior. The general motive for my study is connected with the fact that there are no publi- cations in this subject. On the base of my results, included general properties og Lublin's soils and general forms of arsenic which are separated in the process of speciational chemical analysis, one may say that in the Lublin's soils (which are characterized by the typological difference and different types of using), the content and collocation of arsenic is an average of the natural elements and the influence of the antopressure. The most concentration of arsenic in surface levels of the Lublin's soils proofs that there is essential human's influence for arsenic's behavior. On the base of the properties of studied soils, it wasn't exceeded arsenic norms for the usable group A in the sense of Polish Environment Ministry status about standard of qualify of the soils. On the other hand, a sum of arsenic fractions available for microorganisms and plants, constitute about 11% in the investigated soils of Lublin. Therefore, there is no danger of pollution of soils of Lublin by this element and intaking of arsenic by human and animal organisms. The conclusion of the research carried out is that the fractions connected with crystallic and amorphic iro oxides have the highest share in the total arsenic pool. Because of little mobility of these forms, iron oxides occuring in soils may constitute an effective barrier for this element availability for soil microorganisms and migrating to the groundwater. Carried out investigation allowed better recognize of various arsenic forms content and their interrelationships in the soils of the city of Lublin. The results of the research confirm also that soils within the agglomeration borders are subjected to antropopressure of different degree of intensity and show high variety in terms of morphology and physicochemical properties. The results of my study may be used to the description of the natural background of the content of arsenic in Lublin's soils and as criterion for valuation of the level of arsenic's concentration in another urban soils. My study can used also as methodological background for the valuation of the level of impurity of soils by arsenic.