Abstract: In the Yuanyou period of Emperor Zhezong of the Northern Song Dynasty,a dozen prominent scholar-bureaucrats,such as Su Shi,Su Che,Su Song,Lv Dafang,Liu Zhi,etc,who were either Grand Councilors or Vice Grand Councilors at the time,had successively written postscripts for an article named Lishi Shuxianji in a few years time.This is a typical group postscript writing behavior of high-ranking officials.The writing time of these postscripts mostly concentrated on two time intervals,which were respectively the second and third years of Yuanyou,and the sixth and seventh years of Yuanyou.Only a few postscripts were written in the spring of the eighth year of Yuanyou,whose authors were not well-known and have left little biographical information.Excavating the local chronicles record of these postscripts,analyzing their contents,and exploring their authors resumes could correct mistakes and errors in some historical records.By outlining the social relationship between the author of the article and the writers of its postscripts,it can be seen that the change of political situation caused by clique struggle in the Yuanyou period of the Northern Song Dynasty,the coetaneous schoolmates relations related to the system of selecting officials through imperial examinations,and the different political stances of scholar-bureaucrats in the change of political situation had an intrinsic relationship with this group postscript writing behavior.Research on this topic will contribute to deepening the discussion on the communication style and mentality of scholar-bureaucrats in the Song Dynasty.

Key words: Yuanyou period, postscript