The article deals with the program as well as content part of the theoretical conception of capturing Czech lexis in the form of a lexical database. It briefly outlines the development of the Praled software and describes the overall structure of the Pralex LDB in terms of its macrostructure as well as microstructure and the main principles of the treatment of database items (the data obligatorily provided with every entry). The ending is devoted to the potential of the application of this lexical database not only for a future monolingual dictionary and specialised dictionaries but also for various linguistic research projects.