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In this talk,I will show the progress in the iron-based superconductivity,especially in FeSederived materials,in the past a few years.I will show my results on the characterization of intercalated FeSe superconductivity.We use neutron powder diffraction to carefully determine the crystal structural of FeSe intercalates.It is found that there is strong coupling between distortion of FeSe layer and superconducting transition temperature.