This research aims to address issues of poetic construction, the function of poetry, the role of poet and cultural life expressed in the personal letters of writers which work and life reflect na aesthetic search. They represent the Brazilian modernism and discussions that interfere and cause collisions in this cultural and aesthetic time. This dissertation addresses questions of some poets by themselves in relation to their creative writing through their personal letters. The main actors of this research are the poets Mário de Andrade, Manuel Bandeira, Carlos Drummond de Andrade who in their letters and works demonstrated pursue an aesthetic design and are willing to discuss their careers and cultural poetics by requiring matches for many times, a critical and self-reflexive view, but also revealing facts of Brazilian cultural life and its characters. The present research examines the whole letter-writing as possible telling events, historical and individual experiences, understanding that letters make, and perceive feelings, reactions and complexities of being that, together with literary works, should make counterpoints, interactions, continuity and ratifications of their artistic work.