Although the subject of possible worlds is discussed in logical lesson’s, this article aims to exclude this tradition. Our intention is to examine the subject of possible worlds for Nietzsche. It may seem to some that this view is inappropriate and that Nietzsche is against logic and reason and every mental or philosophical fact in his vision of the world, whether in his demolition of the peer worlds built by the philosophers before him, as idols, or in his establishment at his own possible world. In order to refute this objection, we must rely on what is called " the possible worlds " as with Nietzsche, and it is this which is the subject of our thinking in this regard. Consequently, our treatment of this question is not an arbitrary projection of the logical interpretation of Nietzsche's philosophy, but rather an investment of certain notions of new research in the logic of modalities in order to expose some of the submerged ones in Nietzsche's critique of the concept of the world. As for our examination of the subject, it includes the study of certain hypotheses, in particular the relative possibility of the ideal world with Plato, the distant possibility of the underworld as we find in the priest, the transcendental world in the conception of Kant, the total impossibility of the world, the decline of the better world and finally the radical possibility of the after world and the parallel worlds - the ideal possibility, etc.