Ti-xing, Ding-shi are two ranges of Xie Liu's thinking about writing style. Ti-xing investigates writing form and author's temperament. It's belong to the subjectivity cause of the fonning style. Ding-shi investigates writing form and the trend of language. It's belong to the objectivity cause of the forming style. The paper tries to investigates the meaning about trend and the relation between feeling, form and trend. It looks for the writing intention and reason.