The author researches the archive documents and opens the question of the presentation of Emil Belluš in the role of a scientist and theoretician of architecture. Belluš’s activity in this field was connected to his effort to develop Slovak technical education and to initiate development of science and technology. In 1955 he founded the Institute of Building and Architecture as a part of the Academy of Sciences, where the architectural science and theory started to be developed. As far as his own scientific and theoretical activity is concerned, his asset has been considered by his monographer as popular theoretical approach. Belluš’s founding activities in creating the architectural science and general theory of architecture in Slovakia is undoubted.