For Freud and Lacan psychosis is not a deficiency. Nowadays, Schreber’s text still remains an unequalled paradigmatic treatise. For Freud, paranoid delirium is an attempt at recovery, and for Lacan it is an attempt to analyze severe logic. The thorny question of psychotic transference still remains. Freud does not believe that a psychotic patient is capable of analytical transference. Lacan thinks that at the beginning, the transference is likely to provoke a trigged of, furthermore the psychotic has the object a in his pocket. Freud continued seeing psychotic patients even though he dissuaded his students from doing so. Lacan, who psychosis before psychoanalysis, suggests that the analyst should not draw back in the face of psychosis. Can the psychotic subject, which stays out of every social bond established, be received by analytical speech? This is what we examine throughout the thesis. If the subject is not cured of his psychosis, can he invent substitutes within the treatment in order to deal with it? Thus, there is no general solution but rather a contingency approach which can betaken. There is no guarantee but there might be the analyst’s desire…