“Zhengwufuren Gui Ruzi”(＜鄭武夫人規孺子＞) is one of the five old documents contained in the 6th release of Tsinghua Bamboo Slips(淸華簡) - a collection of Chinese texts dating to the Warring States period, acquired in 2008 by Tsinghua University. “Zhengwufuren Gui Ruzi”(＜鄭武夫人規孺子＞) depicts a story happening at the Royal Court of Zheng(鄭) after the passing of Wugong(武 公). It contains the advice and caution(規誡) of Wufuren(武夫人) to her young son Zhuanggong(莊公), successor of Wugong(武公), intending to prevent him from ruling the nation and describes the subsequent developments. This bamboo slip document reveals an unknown fact that Wugong(武公) resided in Wei(衛) for 3 years after he succeeded to the crown, which could possibly be related to the political disturbance at the time of the fall of West Zhou(西周) and the transfer of capital to the east(東遷). It also contains several terms related to the mourning rites, thus allowing us to know the actuals of the mourning of the Pre-Qin period and compare them with relevant clauses in the ancient books on ceremonies and rites, including the Yili(儀禮) and Liji(禮記).