The major purpose of this paper is to found the differences out between Cheng-guan's(澄觀) and Fa-tzang's(法藏) philosophy. Fa-tzang is regarded as third-master of Hwa-yen Discipline(華嚴宗), and Cheng-guan fourth-master, in Chinese history. Cheng-guan's philosophy comes to an conclusion, ”Everything Unobstructive”(事事無礙), but Fa-tzang's inference is ”Main and the Associate theory”(主伴圓融). The fundamental theory of Cheng-guan's philosophy is tathagatagarbha(如來藏) thoughts, but Fa-tzang's is not. These differences led to the situation that Cheng-guan's philosophy is entirely different from Fa-tzang, although both of them are regarded as Hwa-yen Discipline masters. Cheng-guan have transformed Fa-tzang's philosophy to his own modus, and influenced the development and followers of Hwa-yen Buddhism later in ancient China.