In the article researches рН, the maintenance of humus, heavy metals, sulfur and arsenic, natural radionuclides are given in the top soil horizon in a zone of influence of an ash dump of Khabarovsk CHPP-3 for an assessment of technogenic impact of an ash dump on environment. It was established that an ecological situation in a sanitary protection zone of an ash dump was rather satisfactory, but the excess of maximum permissible concentration (approximately admissible concentration) are re-vealed on some elements in the superficial hori-zons of soils (on cadmium, lead, zinc, arsenic, nickel, cadmium by 1,1-2,5 times, on sulfur by 2,8-9,7 times). Average sizes of the specific activity (SA) of natural radionuclides (ERN) in the superfi-cial horizons of soils in a zone of influence of an ash dump in a zone of influence of ZShO are high-er, than in adjacent territories on: to potassium-40 - in 1.2, to radium-226 - 1,6 and to thorium-232 - 2.1 times; on border of a sanitary protection zone (500 m) - on thorium-232 by 1.74 times. On the basis of the obtained data the return and direct cor-relation connections between рН and the content of heavy metals, рН and specific activity of natural radionuclides, and also humus and the content of heavy metals, humus and specific activity of natural radionuclides on Cheddok's scale were revealed. The most close correlation connection was estab-lished for humus and gross forms of vanadium, copper, sulfur, acidsoluble forms of copper in the top layer of the soil horizon, and also thorium-232. Between рН and toksicant the most close correla-tion connection was characteristic for gross forms of sulfur, lead and acidsoluble forms of copper in the top layer of the soil horizon, and also radium-226.