The authors discuss the sci-tech libraries in historical aspect; these libraries make the key element of the national system of sci-tech information and information services and support national science and technology. They follow the dynamics of building the network of research institutions and special sci-tech libraries that replaced technical, factory and company libraries. The role of the USSR State Public Library for Science and Technology (USSR SPLS&T) is highlighted: during the Soviet era it was the country’s head sci-tech library, the main methodological center for technological libraries, interdepartmental coordinator of user services, collection development, interlibrary loan, and translation of scitech literature. The authors emphasize the importance of the national regulation of sci-tech library and information services, and their development through building the state system of sci-tech information. The authors also examine the goals of t he S PLS&T U SSR a s a research institution in the area of library and bibliographic studies; SPLS&T supported the unity of efforts within the system. The authors analyze the implementation of the national sci-tech program; within the framework of the program, the RNPLS&T acts as the head agency of the Automated System of the Russian Union Catalog in science and technology and provides for interaction of sci-tech library network and sci-tech information institutions in using the databases by associated members. The authors substantiate the need for the new national system of sci-tech information based on the laws and regulations adopted in the recent decades. They analyze the results of 2023 All-Russian monitoring of sci-tech libraries and sci-tech information centers; evaluate the capacities of sci-tech libraries for supporting corporate projects, scitech professionals and researchers.