Abstract: The subject of this research is the system of views of the prominent political leader of the period of Civil War, constitutional democrat G. K. Guins upon the nature of the political regime of A. V. Kolchak and ways to reform it. The goal consists in formulation of concept of democratization of the system of government established in Siberia in November 1918, based on the synthesis of assessments, propositions and remarks of the cadet. The project of G. K. Guins is unique for its integrity and is structured on the basis of profound analysis of the formed situation in the East of Russia. The author explores the essence of Kolchak’s regime and prerequisites for its reform; gives assessment to the proposal of rightwing and leftwing constitutional democrats of Siberia; as well as reveals the content of the project of G. K. Guins. The scientific novelty is defined by the fact that this article is first in Russian historiography considers the system of views of G. K. Guins upon the nature of Kolchak’s regime and ways to reform it an independent subject of research. The conclusion is made that G. K, Guin’s propositions on consolidation of power in the East of Russia during the rule of A. V. Kolchak were aimed at democratization of the established after the coup of November 18, 1918 regime, and suggested the creation of law-advisory council called to ensure business cooperation between the opposition, population and government.