The work is devoted to the study of the processes of digital transformation of economic entities considered as open socio-economic systems. With the use of statistical data, the further development of digital transformation processes, as well as the need to develop information-analytical and methodological support for the management of these processes, is substantiated. The essence is systematized and the author's concept of digital transformation of the socio-economic system is developed, its goals and directions for various levels of the economy are considered. The stages, directions and indicators of the digital transformation of public administration are considered. The directions and dynamics of the digital transformation of the subjects of the Russian Federation and its problems are studied. The purpose of the study is to study digital transformation in the context of managing the development of socio-economic systems, states of the subject, object and management system, as well as the formation of a complex of problem fields of digital transformation of the subjects of the Russian Federation in the context of their functional, structural, resource and information characteristics as open dynamic socio-economic systems. Materials and methods. The statistical basis of the new study was data from Russian and foreign analytical agencies, data from Rosstat and international statistical databases that characterize the processes of informatization and digitalization of the Russian and world economies, data on digital transformation strategies of the constituent entities of the Russian Federation, presented on the websites of the Government of Russia, federal and regional executive authorities. The study used methods of correlation-regression, cluster, structural and content analysis, as well as a systematic approach. The theoretical and methodological base was the work of Russian and foreign researchers, reports of world and Russian consulting agencies and research centers, legal documents of the Russian Federation and international organizations. Results. The role, meaning and functions of digitalization are systematized. A definition of digital transformation has been developed as a characteristic of a socio-economic system used to describe the goals, process and results of digital deve¬lopment, leading to a transformational change in the parameters of the control and managed systems, transferring systems to a qualitatively new level, which manifests itself in a radical change in the business model, business processes, products and services. Regional disproportions in the digital development of the constituent entities of the Russian Federation are diagnosed. The problematic fields of digital transformation of the subjects of the Russian Federation are identified in the context of 4 components – their functional, structural, informational and resource description as SES. Conclusion. The developed concept of digital transformation is based on the system paradigm and can be used to develop a set of methods, models, indicators and indicators for the digital development of socio-economic systems. The developed complex of problematic fields of digital transformation of the subjects of the Russian Federation as SES can be used to develop management decision support systems, activate the digital development of the subjects of the Russian Federation, increase its effectiveness, efficiency and sustainability.