The 21th International Conference on Finite or Infinite Dimensional Complex Analysis and Applications(ICFIDCAA) is jointly organized by Nanjing University, University of Science and Technology of China and Shandong University. The Conference will be held at Nanjing University. The primary goals of the conference are to promote and encourage international collaboration and scientific exchanges among speakers and participants, to share the most recent development in the areas of complex analysis and its applications.