The "Strength of Character" proposed by Liu Xie in The Literary Mind and the Carving of Dragons underwent diversified changes in the poetic discourse of Song Dynasty： the poetry style of "Shangjian" advocated by Ouyang Xiu likewise in the middle of Northern Song Dynasty emphasized its vigorous and extensive side； the Jiangxi Poetry School paid more attention to how the poet's temperament and character are presented in poetry through language， the pursuit of language "New and Thin" made them focus on the requirements of its "Strength" on the words， and additionally the "Strength of Character" had changed into "Qi Character" under the influence of the "Qi?oriented Theory” of neo?Confucianism in Song Dynasty； Yan Yu， a representative of poetry theory in late Southern Song Dynasty， corrected the view of Jiangxi Poetry School， but turned the theory of "Strength of Character" from an aesthetic requirement to a generalization to the style of Jian'an Literature， from which the most commonly used "Jian'an Strength of Character" in current academic evaluation on it has originated.