Afer Shu Sheng's Lin Shu Chuan Chu, Various theories and different opinions arose. Based on Duan Yu Chai's Shou Wen Hsu Chu, the writer expanded on it, trying to clarify the main idea of chuan Chu. There are seven paragraphs in the article: 1 Introduction 2. The term ”Chuan Chu” is always the same 3. An explanation of Dai and Duan's theory 4. An illustration of Duans definition of Chuan Chu 5. Duan's innovation of Chuan Chu 6. Duan's his torical view about Chuan Chu 7. Conclusion This article may serve as a reference material in dealing with Chinese charaters.