Talent training is not only one of the main functions of colleges and universities, but also an important way to meet the needs of society. With the progress and development of science and technology, social issues have shown a trend of integration, and high-leveled compound talents with multidisciplinary theoretical knowledge and open thinking mode are in urgent need in solving social problems. Therefore, the status of interdisciplinary talent training is gradually improving. Interdisciplinary postgraduate education is essentially one of the social subsystems, which is constrained by society and follows the pace of the changes in society. Based on Parsons’ “AGIL” model, this paper analyzes the development of interdisciplinary postgraduate education, summarizes the existing problems, and proposes an optimal path for interdisciplinary postgraduate training from four functional dimensions to promote the smooth development of interdisciplinary postgraduate education.