Yu Yue, whose nickname was Yin fu, was characterized by LianQiCao as the last academic scholar who clanged on to the Orthodox tenaciously in the late Qing Dynasty. He contrived to extract the predecessor’s research results and pursed for creativity and overly. After he resigned and returned to his home town, he was devoted to writing. Over his life tine, he had approximately 500 volumes of work. He produced so many papers that they were as high as Yu Yue himself. Among those, “Gu Shu Yi Yi Ju Li” is the most influential work. This book analyzes, induces, deuces the phrases and summarizes them into 88 rules. It is a must read book to study the Chinese ancient literature. The author begins by first explaining the motive to write the book “Gu Shu Yi Yi Ju Li”. Yu Yue thinks that the changes in time and the inconvenience to travel between the North and South of China are the main factors that resulted in the language barriers. It causes problems for the people in the later time to read and understand the ancient literature. Secondly, via the rules analysis, Yu Yue induces the principle of “Normal to Change”. Finally, Yu Yue uses the following methods to explain the ambiguous meaning in ancient literature, including deriving the semantics of a word from its phonetics, the syntactic judgment, rhetoric analysis, and character comparison by its appearance in different contexts. From what is discussed above, we can know the importance of this book in the philology study: It creates a new style in writing and plays a transition role between the ancient and the contemporary in regards to its content.