One of the stages of architectural and archaeological research of the Assumption Cathedral dates back to 1968-1972. The conducted studies and the results obtained on their basis allowed M. V. Kholostenko, P. P. Tolochko and V.P. Petropavlovsk propose conservation activities with the restoration of the foundations of the John the Baptist Church, the foundations of the northwest corner of the ancient part of the cathedral and the withdrawal of the masonry of the western wall to the level of the ground floor windows. It was also proposed to restore the main entrance to the cathedral in accordance with the project of M. V. Kholostenko, to restore part of the main facade , preserved with the reproduction of the main entrance portal, window opening and part of the wall masonry, to bring the brickwork to the level of the window sills of the first floor Khreshchatyh pillars of the western dome of the arch, arrange and cover the metal roof fragments of masonry. At the same time, M. V. Kholostenko attempted to develop a reconstruction project of the Assumption Cathedral and the interior of St. John the Baptist Church in its interior. The project of reconstruction of the Assumption Cathedral was developed in 1980-1981 by specialists from the Research Institute of Theory, History and Perspective Problems of Architecture. The possibility of reproduction was justified by the presence of surviving fragments, measurement drawings, archival materials, and based on the study of photos of the cathedral to its destruction by photogrammetry, a project was developed for its reproduction. By the way, the method of constructing the natural dimensions of a destroyed and reproducible object based on the analysis of archival photo fixation was applied by modern restorers during the reproduction of the St. Michael’s Golden-domed Cathedral.
Despite the seriousness of the work, in the 80s of the 20th century, the basic concept of stylistic decision of the interior of the cathedral was not produced, and the only real proposals concerned only the possibility of exposing the surviving fragments to the interior.
Historical aratekturni and petrographic studies were carried out, which were carried out by specialists from SSTC “Konrest” and the institute “Ukrproektrestavratsiya”. In particular, the construction periodization of the Assumption Cathedral, the explanatory note to the project proposals for exhibiting the ancient church of the Assumption Cathedral with drawings of the project proposals, reasonable chronological periodization of the Assumption Cathedral on the basis of the material composition of building materials and compiled cartograms piezo periodization. These buildings were carried out in order to substantiate the project proposals for displaying the ancient remains of the Ulensky Cathedral of Kiev-Pechersk Lavra in the process of its restoration and reconstruction, exposing these remains was provided mainly from the interior and fragmentary external walls of the building by arranging display probes and holes.
A feature of these studies was the percentage of authentic remains of the Assumption Cathedral was the largest and included not only the foundation, but also fragments of the above-ground part of the cathedral.
Within the object, there was a significant discrepancy both in the level of the depth of the five foundations and in the materials that formed the foundations, due to the uneasiness of the construction of various parts of the cathedral. For the foundations used blocks of sandstone, plinfu, limestone solution of white color mixed with crushed ceramics, limestone-sandy solution of gray, lime-cement solution of pale pink color, limestone-sandy solution with the addition of white brick of the XVIII century.