The outline of the technical libraries and the national system of scientific and technological information in the U.S.S.R. is introduced in this essay in the following ways: Chapter 1 Explanation of the kind of the libraries in order to clarify the characteristics of a technical library, Chapter 2 "Head library" and "base library" which has developed in the process of the cooperation in library activities, Chapter 3 National system of scientific and technical information in the U.S.S.R., concept of which has become clear in the latter part of the 60's of this century on a world-wide scale.