The article attempts to show the relationship of the aesthetics of Acmeism and language of the poetry of Mandelstam. Provided that stipulated in the policy work of the poet and acmeist "Morning of Acmeism" and "On the nature of the word" requirement of logical connection and attention to corporeal details, find expression in the language of the poetry of Mandelstam. It is proved that the consistency and "materiality" has led to active use of the language of the poet of comparative constructions. Quantitative data on the use of comparatives with the aim of creating a clear and logical syntax in the poetic works of O.E. Mandelstam. It is shown that comparative structures are used by the poet, the object of comparison is represented by the form of the genitive of the name. Conducted thematic analysis of the vocabulary used in the object position in the comparison. The names of the different lexicalthematic groups in the role of the object of comparison is proposed to allocate three blocks: Nature; People; Abstract concepts. Found the largest frequency in the object position comparison of the names that call the phenomena of Nature, including the names of natural elements, animals and plants, inanimate realities and objects. It is argued that in the comparative constructions with the names of groups and the Nature in the position of the object of comparison is recorded in the details of the visible world is expressed most exactly realistic, ordinary. Conclusions are made about that in the comparative constructions in the position of the object of comparison represented by the form of the genitive name of the different lexical-thematic groups, most often there is the thematic group of names, naming inanimate objects (tools, artifacts, and vehicles; substances, materials, minerals and their products; food and beverages; books and documents; buildings and their parts).