The dissertation intends to examine the signification of Empedocles’ choice to express his philosophical system into a peculiar meter, the dactylic hexameter, which is not only considered here as a poetic form but also as a poetic tradition. The reasons why Empedocles made this choice may be studied from several points of view. From a historic and comparative point of view, Empedocles’ use of the dactylic hexameter has his philosophy embedded into a particular moment of the development of ancient « philosophy ». Another, sociological, dimension of this problem pertains to the traditional modes of diffusion of dactylic poems, within the frame of panhellenic competitions for instance.More fundamental even is the question of how necessary is the link between poetry and philosophy in Empedocles’ work itself. Is the dactylic meter merely ornamental for a thought that could have been expressed in prose? Is it some artificial varnish, whose only effect would be to obscure the philosophical message? Or does the use of verses show, on the contrary, a substantial stance, meaning that the interpretation of the poetic features and the interpretation of the philosophical doctrine cannot be dissociated?The poetic theory of Empedocles is examined in chapters 1 to 4. Then, a study of the poetic realization of this project takes place in chapters 5 to 7. Finally, an evaluation of the meaning and relevance of Empedocles’ choice in the context of the 5th century is done through the last 3 chapters.