The article states that the writing style determines the forms ofChinese Characters during the process in shaping the characters by analyzing the Characters both in Pre-Qin Days and in Qin Dynasty. In other words, the way of writing influences the result of writing------ the forms of Chinese character directly, moreover, any kind of change in characters’ evolution stems from the slight difference from the previous writing style. Characters are presented by using writing, characters on Bamboo or Wood strips in Qin Dynasty are kept more in the inking words in the early forms of Chinese characters; meanwhile , writing style in Qin Dynasty is a transitional form in the change from seal script to clerical script; at the same time, it includes both the writing motivation of seal script and other writing styles, such as, clerical script, running script and cursive script in the following periods and conceives rich connotation in writing styles. So, we know that , to some extent, the writing style can restrict or improve the process of characters’ evolution by researching the writing styles’ influence on the following characters’ shape. And as an internal factor, it is writing style itself that influences the Chinese character’s shapes. In this way, we push the traditional static research of forms of joining different parts to form the Chinese characters and that of changing rules of different parts in Chinese characters to the dynamic level in Chinese characters’ research.