In the past three decades,molecular magnetism has been a rapidly growing interdisciplinary field in chemistry,physics and materials sciences.It covers diverse range of topics including inorganic/organic/hybrid magnetic molecular materials,multifunctional and/or switchable magnetic molecular materials,molecular nanomagnets,nanostructural molecular magnets,molecular spintronics and biomagnetism.Much research on molecular magnetism has been carried out in China both before and after we organized the International Conference on Molecule-Based Magnets 2010(ICMM 2010) in Beijing.More international experts are involved in developing molecular magnetism with Chinese chemists and physicists.As the home of the compass,we do look forward to the renaissance of magnetism in such an interdisciplinary field.I just visited Luoyang in Henan province,which was the capital of 13 dynasties in China`s history and is well known for the peony.Luoyang Peony Heaven! The peony was even proposed as the National Flower of hina.More than a hundred kinds of peonies bloom with various colors in spring.This special topic on "Molecular Magnetism" collected some of the latest research in the garden of magnetic molecules.