Abstract: Discusses activities of the Republican library of the Tatar ASSR them. V.I. Lenin during the Great Patriotic war. The highlighted characteristic of this period of trend, consisting in the application of the composition of the reading groups, the development of mobile library points, moving the centre of gravity in service to the readers on military subjects, a decrease in the dynamics of recruitment literature, incompleteness of the library staff and the deterioration of conditions of work.