[en] Full text :The study of geotectonic modes of organic zones has important meaning for specifying of Earths' deep structures. The present work is dedicated to research of Paleozoic geotectonic modes of Mediterranean Sea zone by character of regional gravity anomalies of Caspian Sea and Azerbaijan. There are three typical maximums in Buggier reduction for gravity field in researching region: Mughan-Garabaghs (onshore); South-Caspian and Middle-Caspian (offshore). Mughan-Garabaghs and South-Caspian maximums are represented by low intensity and sizes and are not interconnected. Mughan-Karabagh maximum is expressed in oval-shaped form, and its impossible to judge about its spreading direction, but South-Caspian maximum has dominant spreading in NW-SE direction. The geological nature of South Caspian maximum was associated with tectonics of folded surface of crystalline basement by previous researches, but revealing of Mesozoic complex on 12-14 km depth by seismic method of survey showed that the nature of this maximum is associated with deep-buried intrusive inculcation. The Middle-Caspian maximum is associated with Turan plate-Epi-Hurricane platform, and this is beyond doubt for specialists. Analyzing above mentioned comparison features of these regional anomalies, we suppose that they arose just in connection with change of geotectonic modes in Paleozoic Age