The Inteational Workshop on Nuclear Dynamics in Heavy-Ion Reactions (IWND2012) was held in Shenzhen,China,Dec.16-19th,2012.This is the 3rd edition of this series workshop.The 1st one was held in Beijing,2007 and the 2nd was in Shanghai,2009.The purpose of the series workshop is to exchange information with inteational and domestic experts on nuclear dynamics and to focus on some current hot topics in this field.More than 80 physicists from 30 institutions participated in 2012 workshop and 42 of them gave talks which covered a large variety of hot topics,including nuclear reaction dynamics and isospin effected in heavy-ion collisions at intermediate and high energies,the equation of state of isospin asymmetric nuclear matter and many-body approaches,especially the density dependence of the nuclear symmetry energy and the structure of neutron stars,the phase transition of strongly interacting matter,especially the nuclear liquid-gas phase transition and the QCD deconfinement transition from hadronic matter to quark-gluon plasma,and reaction mechanism for synthesis of superheavy elements.These talks demonstrated that significant progress had been made in recent years both experimentally and theoretically while there were still a number of questions remaining open in the field.Furthermore,active and fruitful discussions were made on the experimental opportunities in some large-scale scientific facilities and possible inteational collaborations in these areas.