The soil cover is the national wealth, natural resource and the principal means of production in the Republic of Moldova agriculture. Purpose and research tasks consist in setting up the changes made by erosion on the chemical characteristics of the ordinary chernozems. Were conducted the necessary investigations on the territory of the reception basin “Negrea”. In this paper are assessed humus content, carbonates, pH, nitrogen, phosphorus, potassium and their distribution on the soil profile. From the data obtained on the changes of the chemical characteristics of investigated soils, it has been noted that appears significant quantitative and qualitative differentiation of these, depending on the degree of erosion. The research has shown that the chemical characteristics of soils with different degree of erosion are more strongly influenced by erosion. All this has led to the acceleration of erosion, including linear (Andrieșet al, 2003). Experiments were located within the perimeter of the village Negrea, Hincesti district, in the hydrographic basin of Lapușna river. We have studied four main profiles of ordinary chernozem with different degrees of erosion, characterized by different type of profile (Cojocaru, 2015). Soil samples collected in the laboratories of the Institute of Pedology, Agrochemistry and Soil Protection „Nicolae Dimo” were analyzed, and the results demonstrated the influence of the erosion process on the chemical characteristics of investigated soil (Arinushkina, 1970; Kauricev, 1980; Mineev, 2001; Sokolov 1965, 1975). In this article, we present data determining the humus content by the method Tiurin layers 0-30 cm for not eroded and weakly eroded soils, which are characterized as moderately humiferous with humus content of 3.1 - 3.7%. Soil reaction determined by potentiometric method of the not eroded soils, often the weakly eroded soils are neutral for the Ah and Bh1 horizons with values ranging from 6.9 to 7.2 and weak alkaline for the Bh2, BC and C horizons. According to calculations, by the investigated soils crops cultivated with hoes, nitrogen loss is 18 kg/ha. For poorly eroded soils lost 23 kg/ha of nitrogen, and the moderately eroded withto 28 kg/ha. Highly eroded soils lose - about 40 kg/ha of nitrogen (Cojocaru, 2015).