Th e monuments of medieval architecture from historical Moldova, surviving even before the periods of the formation of the state and until late periods, have neither dating nor direct information about their construction. Most of the ecclesiastical architectural heritage is valued historically on the basis of the documentary information and of the oral and written literary sources, with selective archaeological investigation, but which, without taking into account the architecture of the concrete monument, led to inadequate results. It is necessary to elaborate a method of study of monuments, which would be specifi c to the process of creation of the architectural form, being in the spirit of the creativity of medieval culture. Th is would be the algorithm, which is presented as the structural-numerical model, in which a decisive role, as the manifestation of the universal law “quantitative transition into quality”, are the proportions – variable numerical units that ensure the technical and visual requirements of the architecture of buildings, specifi c to each historical period.