Some properties of E. coli ribisomal proteins, e. g. molecular weights, isoelectric points, amino acid composition, are reviewed. The three-dimensional structure of the proteins in solution has been studied and the difficulties and discrepancies arising from interpretation of the results obtained have been revealed. The peculiarities of the amino acid sequences typical of the majority of the proteins or the amino acid sequences presenting unique features are interpreted in terms of the primary structure of some ribosomal proteins. The primary structure of the proteins determined with the use of interesting methodological procedures is discussed.