In the paper authors present a research project defined as an inflection description of Polish verbal phraseological units and its implementation. In the first three points the main aims and methodological assumptions are discussed. The latest point applies to computer applications needed to the formal description of Polish verbal phraseology. Analysis of the verbal Polish multi-word units as well as a dictionary comprising 5000 analised units are the main aim of the project. The fundamental problem in the linguistic description is an answer to questions: How regular is a paradigm of verbal multi-word unit? How does it depend on the main segment of the unit? How is it determined in semantical and syntactical way? The project also assumes a development of available application, Toposław, used to formal description of Polish.