Abstract: The prose about the studies of Confucian classics,history and politics of the “Tri-Su's” was highly valued by the literary selections during 1127-1297,a crucial period of prose classicization in Northern Song Dynasty.The joint name of the “Tri-Su's”in the system of classicization also contains the elements of the Su's characteristic studies.The substantial value of Su Xun and Su Zhe's proses obviously relies on their academic values.Meanwhile,as the origin of the Su's characteristic studies,the contemporaneous intellectual elites defined Su Xun's prose as a kind of comprehensive classics with multiple ideas,different writing skills and various personal styles.The internal thoughts of Su Zhe's essays about historical events are constantly welcomed.Moreover,the Confucius scholars highly regarded Su Zhe's thoughts that was in accordance with the orthodoxy Confucianism.

Key words: Tri-Su's:Su's, characteristic, studies:classicization:Confucianism, in, Song, Dynasty