N the south of the Far East of Russia the at-tempts to assess the quality of water with the help of nematode communities have been undertaken only in recent years in the basins of the lower and middle Amur in the basins of Lower and Central Amur. The material for researches was collecting soil nematodes in coastal biocenoses of the south-ern part of the Amur basin. Trophic Diversity Index (T); Maturity Index (MI), reflecting the stability of the nematode community on scale Bongers s-r 1 to 5; Shannon's Diversity Index (H ') considered to be one of the main in reliability and convenience to practical use were applied to the characteristic of biodiversity. The fauna of soil nematodes of coastal cenose of 11 sites in the territory of the southern part of the basin of Amur has been studied for the first time. The representatives of 47 genera of nematodes were identified from different trophic groups of nematodes of dominant families Criconematidae, Dorylaimidae, Longidoridae - 69 % of the total number of dominating nematodes. Phytofagous was dominated by the type of power. The excess of maximum concentration limit for iron, manganese, cadmium, cobalt and nickel in the tests was noted, and the excess of maximum con-centration limit of the content of lead, copper and zinc was small therefore it was impossible to speak about any influence on the groups of nematodes. Shannon's Diversity Index (H ′) accepted the values from 1.0 to 1.5 in five points, from 1.6 to 2.0 - in 4 points, over 20 - in two points. Consistent with this, the coastal areas along the brook Tigrovy, Luchegorsk Reservoir, Ilyinsk lakes, the river Komissarovka below the village of Dvoryanka, the river Kabarga have to be considered dirty; coastal soils of the rivers Medvedka, spring "Tiger", rivers Bikin and Komissarovka around with Ilyinka - me-dium and only mildly. The indicators of chemical pollution in general confirm it. A major factor of pol-lution of coastal sites of the rivers was motor transport as the tests were selected near the roads. The purest coast, by the results of chemical analy-sis and from the values of Shannon’s Index, was noted near the rivers Chor and Komissarovka (5 km higher from the route).