In this paper, the author resumes her research on psychosis, that forme rly focused Freud's conceptions on this condition and the lack of success of clinical psychoanalysis in such casest in spite of a well-founded theory. Discussión now looks into the theoretical and clinical breakthroughs that stressed the possibility of a clinical psychoanalysis for psychosis. M. Klein and J. Lacan's clinical concepts are thus retrieved. Although very different, both authors share some ideas, as that of an oedipal anticipation in some very early moments of the infatile psyche, which is fundamental to the contemporary clinic of psychosis.