The paper presents the results of studies on caddisflies of “Echo” ponds in the Rozto­czański National Park, before and after their reconstruction in 2002-2004. On the basis of species composition, total numbers and four indices, the following conclusions are given: the caddisfly fauna has been changing its character – small water body species are replaced by lacustrine ones; the number of species has been fluctuating significantly and the process of recolonization of three taxa has been also observed. Species diversity has been decreasing, however, the state of fauna from the last year of studies can be treated as an initial lacustrine stage and next species typical of lake may be expected.