ZHOU You-yuan,professor, academician of the Chinese Academy of Sciences, supervisor of doctoral students, a reputed astronomer, member of the Academic Committee of the Nationl Observatory, Director of the Astrophysics Center of the China University of Science and Technology and special postion professor of Guangzhou University. He has been primarilly engaged in research in the fiedlds of Galactic Nucleus of Astronomy, Cosmology and Cosmic Constant.