The authors examined the pattern of mercury distribution in soils and plants of Usolye-Sibirskoe town and the surrounding area. The mercury contents were measured in the town and surrounding forest soils. On the background of increased mercury it was found that in forest soils this metal was accumulated by plants and high fungi in larger amounts. The fact may be caused by a significant mercury contents in organic forms, which were obtained by the stage-wise extraction. Among other studied forms, the organic forms of mercury largely contribute to the mercury migration cycles. Even if, the contents of mercury in soils and plants are sufficiently high, the mercury total contents do not exceed sanitary and hygienic norms.