The article describes theoretical issues, principles of constructing and functioning of the Automated System of Morphemic and Derivational Analysis (ASMDA). The ASMDA system performs the following functions: 1) information system; 2) automatic morphemic annotation of text; 3) automatic linguistic constructor for frequency dictionaries. Description of the use of ASMDA as an automatic morphemic analyser of Ukrainian texts’ lexicon is in the centre of attention; this article also describes structure as well as search and classification options of electronic morphemic dictionaries presented in linguistic research system of the Corpus of the Ukrainian language.