The purpose of this study is to identify the dynamic development of the national, cross-departmental, and complex program of Integrated Health Service Post or called Posyandu in Indonesian. By using the innovation system approach, this paper aims to view this program in terms of the involved actors, the linkages between the actors, and the possible knowledge sharing and diffusion. The main result from this study is that there is a dynamic and multi-relationship between actors engaged directly and indirectly to this program. In sum, there is a critical suggestions found to improve Posyandu program within the future.