82 species of Heteroptera belonging to 13 families have been found in flood-plain forests Alno-Padion in 4 sites. including 35 species in the ground cover and 47 in the canopy layer (39 on alder, 15 on ash). Species composition of the Heteroptera communities under study has been investigated and an ecological analysis carried out. Heteroptera communities from the various areas and sites studied have been shown to differ both in species composition and in the structure of dominance. A group of species characteristic of the ash-alder flood-plain forests under study has been identified.