The Centre de Données astronomiques de Strasbough (CDS) has undergone significant evolution in recent years, with the development of new services and a new interfaces, and an extension of its activities linked to the growth in the amount and diversity of data produced in astronomy. The CDS objectives, and the present status of the services, will be recalled. The main evolution trends observed on the medium term, due to the evolution of astronomy and to the very fast technical evolution, will be described. Finally, the strong growth of interconnection between astronomy on-line services, including electronic journals, will be discussed.