The main object of this essay is to investigate Seamus Heaney`s texts in terms of the decolonial discourse and the anti-textuality, and to demonstrate how Heaney`s realistic writing against the established romantic poems has been revealed in his poetic and theoretical texts. My contention is that Heaney`s realistic writing against colonial lives has been arresting critical attention among the critics, discovering that Heaney`s approach in dealing with real world has become more and more decolonial than any other established contemporary Irish poets. Seamus Heaney has been witnessing the historical moments of the death of his motherland, Ireland, as well as of the Irish people, as was manifested by the history of Ireland. Heaney accepted the humiliating colonial history under the colonial situation in Ireland and the humble Irish people of the present in their ordinary lives. To overcome this devastating circumstance, the poet Heaney has explored the traditional myth which was bracketed and traumatized by the colonized experience and the intellectual and spiritual deprivation. Nevertheless, Heaney has rejected the too much mythical representation by such established Irish poets as Yeats. Heaney reinterpreted the romantically-exaggerated heroism in the myth of the Irish literary tendency as the self-defence mechanism of the colonialized and the dispossessed people. Finally my major focus in my analysis is in his realistic writing as well as in how Heaney appropriates language in his poetry. In this regard, I try to search for the true Irishness which Heaney has made every effort to materialize in his poetry.