Chinese is the representative of ideographic systems of writing. The elements of Chinese writing system are called components which brought in some meaning when used to compose characters. The traditional six principles for analyzing Chinese character structures are known as Liushu. On the basis of Liushu, the modem study has put forward a new theory using character components and component functions to analyze character forms. This paper, under the guidance of this theory, used the mathematic model of tree to describe the structure of Chinese characters, and achieved the computer description of all character structures explained in "Shuowen Jiezi", a wordbook of Chinese seal script. By such method, this paper also developed statistic methods to provide some quantitative data to prove and explain the systematic nature of the synchronic Chinese characters.