Sakya Paṇḍita's “A Clear Differentiation of the Three Codes” with great reputation in Tibetan Buddhism, is generally acknowledged as a famous contemporary work to refute the wrong practice and unorthodox religions. Being an indispensable and a must-known Buddhist Studies reference in Tibetan Buddhism, its wide and rich knowledge makes it valuable in research. Since research of Tibetan Buddhist Vinaya in Chinese-speaking world is rare, the researcher focuses on the first two chapters of “A Clear Differentiation of the Three Codes”, accompanied by the outline of Gorampa's Commentary of “ A Clear Differentiation of the Three Codes-- Expound the Intent of Buddhist Scripts”. It is hoped by offering this annotation of the first two chapters of Sapaṇ's “A Clear Differentiation of the Three Codes”, this research study may give implications for further research. The first chapter〈Introduction〉introduces research objectives and methods for research. Chapter Two describes the founding of Sakyapa School, Sakya Paṇḍita's brief biography and the relationship between Tibet and Mongolia during the twelfth century. Chapter Three presents the Tibetan Verses and Chinese translation of the first two chapters- “Individual Liberation Vows” and “Boddhisattva Vow” of Sakya Paṇḍita's “A Clear Differentiation of the Three Codes”, with an annotation based on Gorampa's outline. Chapter Four focuses on the influence of Sakya Paṇḍita's “A Clear Differentiation of the Three Codes” to Tibetan Buddhism at that time. Besides the general discussion of the Three Codes, this research study especially mentions how to take, give back and purify the “Individual Liberation Vows” and “Bodhisattva Vow”, and some controversy issues. Chapter Five is the final and concluding chapter of this thesis.
