Developing large area, single domain of self-assembling building blocks such as block copolymers, colloids and supramolecular materials, is the most important issue in molecular assembling researches. In our study, we accomplished significant progress toward developing general method of single domain of supramolecular columnar structure with smaller diameters, higher area densities with larger domains compared to those of currently studied colloidal and BCP assemblies. By simply annealing dendrimer thin films between two flat solid surfaces, single domains of hexagonal columnar structures are created over large macroscopic areas. This discovery is significant in terms of the manipulation of organic self-assemblies.