As one of the most innovative, integrated, and cutting-edge science and technology fields, the information and electronics field has developed very rapidly in recent years, and has had a profound effect on almost all other fields. Therefore, technology foresight for this field is particularly important. Sponsored by the project titled "Research on China's Engineering Science and Technology Development Strategy 2035", this study implemented two rounds of investigation into the field of information and electronics, using the Delphi method. By using different approaches, this study was able to identify critical applied technologies, important generic technologies, and potential disruptive technologies that are particularly noteworthy. In addition, this paper draws a careful comparison between two rounds of survey conclusions for "big data technology", "advanced computing technology", "space-ground integrated information network technology", and other important technologies. This paper provides a reference for the establishment of important technical directions for China's engineering science and technology development plan to 2035 and for future technology foresight.