The article dwells on issues concerning the development and evolution of the history of Tajik lexicography in the Middle Ages. It is underscored that scholar in linguistic studies’ attention in the field of lexicography is always attracted by such works from different aspects, because, first of all, dictionary and knowledge covers the real lexical environment of the era of their creation, second of all, dictionary and knowledge clearly reflect their authors’ linguistic opinions expressing new and unique ideas in vocabulary items commentary and interpretation.