In Chinese Academia,the publication of this volume has gained a great deal of applause,about which little more needs to be said here.As its name indicates,this entry in the series aims to reveal the fourth and the last stage of the history of ancient Greek philosophy,which covers the Hellenistic and Roman periods (about 800 years in total).Additionally,its appendix also serves as a brief summary of the foregoing volumes,which is quite helpful.This final volume is the end result of a marvelous academic project,which has lasted for 28 years.Prof.Wang Zisong is the Chief Editor of the whole project,and Prof.Chen Chun-fu is the executive editor of this volume.The new authors,who are mainly responsible for this volume,include Prof.Bao and Prof.Zhang.