In general,it is considered that "Shushu" and "Shu'only have differences on style. But there are many other differences on grammar function and pragmatic value between them. From the ambiguity of "YongCheng Shushu", this paper presents the results of a thorough investigation into the usage of "Shushu" and "Shu". And it reveals that "Shushu"is not only the appellation of relatives , but also frequently is the appellation of society . At the same time , "Shushu" can act as the sentence ingredient alone; "Shu" is the appellation of...