In recent nine years, Li Xiaofang has synthesized a series of mono-metallocene/mono-fluorene/non-metallocene cationic rare earth metal organic catalysts with clear structure, high efficiency and high selectivity, and studied their catalytic performance and polymerization mechanism in various olefin coordination polymerization reactions, and obtained a series of polyolefin polymer materials with novel structures and high stereoregularity, revealing the inherent laws of catalyst structure and polyolefin microstructure. These achievements have greatly promoted the research progress of rare earth metal olefin coordination polymerization catalysts. Up to now, Li Xiaofang has published more than 30 SCI papers, and related papers have been published in international important magazines such as Coord. Chemistry. Review, Angew. Chemistry. The inside is edited by ... J.AM. Chemistry. Socialists, big molecules, etc. By 2065438+July 2003, others had cited it 852 times, and China won the invention patent 5.