The communication of scientific knowledge is an essential and integral element of science, taking part in its political and social justifications. Centered on the field of archaeology, the reflexion is focused here on hypermedia valorisation perceived like a process of transmission, by the digital technologies, of the scientific knowledge aimed at a non-specialized public. Four experiments of design and realization of archaeological hypermedias are used to explore various prospects: endogenous complexity of hypermedias, professionalization of hypermedia mediation, transversality of digital devices, exogenic complexity. We propose that this conjunction of prospects helps better understand of how are defined new conditions of research and action for scientific valorisation. We also want to show concretely how the digital technics take part in the progression of science and in the democratization of knowledge by using digitals tools for mediation.