Therer are many literary researches/interpretations in Poetic Style, focusing on ”the Book of Song”, which is worthwhile exploring deeply, since Ming and Ching Dynasty. YUAN Mei is a literary crtitic of poetry theory in Ching Dynasty had written many comments on ”The Book of Song”, though he had not written a monography on ”The Book of Song”. I collected all those features of Yuan Mel opinions on ”The Book of Song” by YUAN Mei, organized them and found their characters follows: (1) Style Theory (2) Context Theory and (3) Technique Theory. (1)Style Theory points out ”The Book of Song” is not a classics but a literature, not a textual criticism but a poetic context; and including some kinds of answering poem and love poem. (2) Context Theory refers to the disposition assertion, true character and honest personality, and arouses creative power of mind. (3) Technique Theory goes to the rhyme anf rhythem expression, finds sentence features, no necessary to learn and can express originally, their sound and rhythem naturally and expressively, each poem has its own sound and form. The theory of YUAN Mei is useful, though few possesses paradox and prejudice, reaches a higher achievemment in the history position and value in his time and in the poem theory history, because it abolishes a feudal rule, to obtain a literary freedom progressive on the level of the history meanings, enters into a new world, and makes a breakthrough, where the classics researcher cannot realize and they are no dare to touch of those topics, of those poetic theory, and of ”The School of the Book of Song”.