Discourse evolution of foundations, variables and influencing factors in development have led to conceptual evolution in the relation between " communication and development" , So that it's effects are also seen in development planning documents. Historical study of this evolution process in one hand, and recognition of both similarities and differences of important development plans on the other hand, present highlighting process of communication role in this field. Comparative study of communication in Sixth development plan(1355) that is the last development plan of prior regime and fourth development plan(1383) that is the first plan according to Iran's 20-year outlook plan presents historical similarities and differences from development and communication concepts. Prior sixth plan has studied " "informational and communicational aspects of national development planning" on the base of "transition from a traditional society to an information society" in 1355 by the Joint Committee on Information and communication planning, and the fourth development plan's mission is defined "knowledge-based sustainable economic growth "Based on Iran's 20-year outlook plan's goals. This paper describes and analyzes the concept of" communication "and" development" by content analysis of the theoretical documentations of tow plans (the report of planning Joint Committee of information and communication of sixth plan "(1355) and theoretical bases and documentation of fourth development plan "(1383) ) Based on this research, in sixth plan (1355), "national development" as developing aim and "transition from a traditional society to an information society" is problem of the country communication. These two concepts have been followed through Fourth plan (1383) with the goal of "sustainable economic growth" in development and "knowledge-based society" in communication.