The results of the research of changes radioactive caesium contamination for some types of mushrooms from the territory of Shatsk (Volyn region) and Carpathian National Natural Parks (ShNNP and CNNP, respectively) in 1114-2012 are presented. Interspecific and intraspecific dependences of 137Cs contamination of mushrooms as well as the factors that affect them were analyzed. It has been noted that despite the fact that soil contamination slowly decreases over time, during the mentioned time there was no clear tendency to reduce radiocaesium contam-ination in fungal bodies.