The article discusses the issues of comparative analysis of morphological peculiarities and level of comparative degree usage of adjectives in the Tajik literary language referring to the 18th – 20th centuries on the example of the historical productions. It is noted that in the Tajik literary language comparatives and superlatives are expressed in two ways: synthetic and analytical, and the theme explored is of a long history and passed various periods and evolution throughout its historical development. The author comes to the conclusion that in the Tajik literary language of the 18th – 20th centuries the comparative degree of adjective is evinced analytically, namely, comparison is made in such a way that congruent objects are present including the original adjective by virtue of prepositions (especially with the preposition аз-). Comparative adjective are formed by dint of the suffix -тар in the language of the compared historical productions; in general it has some common and distinctive features.
