Zhu Xi advocated Zhongyong (Doctrine of the Mean) as "Practical Learning", while modern scholars intend to interpret its central idea in metaphysical ways. We aims to clarify the difference and attempt to discover the appropriate interpretations of Zhongyong in this article. For centuries, many scholars attempt to prove Zhongyong is not written by Zisi from different aspects of argument. In our article, we discards all arguments and advocate Zisi is the authentic author of Zhongyong. With regard to the title of Zhongyong, we repute that "Zhong" is "Xing" and "Yong" is "Her". "Zhongyong" and "Zhongher" share the common meaning and definition. Moreover, we believe Zhongyong should be one piece of writing originally with all chapters. Based on ideology content of Zhongyong, the writing can be divided into three sections. Chapter 1-11 of Zhongyong is the first section, which is Zisi's dictation; Chapter 12-20 is the second section discussed about Zisi' description; Chapter 21-33 is the third seciont, the description of Zisi' application. The ideology framework of Zhongyong can be divided into three words, "Jiao", "Dao", and "Xing". We can learn from "Jiao" to comprehend the principle of "Dao" then reach the level of "Xing". The essence of Zhongyong teach us to practice the principle of "Jiao", "Dao" and "Xing" in our daily lives as self cultivation .