Аннотация:The article dwells on the level of usage of the degrees of comparison of adjectives. It is underscored that in modern Tajik literary language the category of degrees of comparison of adjectives is expressed by the suffixes -tar (comparative) and -tarin (superlative). It is worth mentioning that the level of usage of superlative degree of adjective with the suffix -tarin is not very frequent in the language of the explored period. As a result of the research and exploration of scientific-historical writings of various periods it became clear that the use of the suffix -tarin is more limited than that of the suffix -tar historically. It is concluded that both comparative and superlative degrees of adjectives in the Tajik literary language of 17th-18th centuries were formed with the help of suffixes -tar (-er) and -tarin (-est) and the relevant language elements are considered to be more non-productive ones in terms of their usage than in modern Tajik literary language.