The structure of two-dimensional perovskites and their corresponding unique exciton properties were introduced， especially the characteristics of phonon in the spectrum. It was analyzed that the strong electron?phonon interaction may be the physical reason why n=3-based mixed two-dimensional perovskites were suitable for photoelectric materials. Finally， the further problems were clarified in order to provide ideas for the optimization of two-dimensional perovskite optoelectronic materials and devices.