Abstract: Based on the knowledge of the structure of Chinese characters, a novel method to describe a Chinese character mathematically is presented. Using this method, 505 components and 6 well-defined operators can express all the Chinese characters successfully. This expression method is simple and natural, and the mathematical expression can be processed according to certain operation laws just as the normal mathematical expression does. It can be applied extensively to the fields such as typesetting printing, advertising, packaging design, network transmission and Chinese mobile communication. Successful applications have been found in fonts automation, Chinese information transmission to users with different platforms and different operating systems on Internet, and knowledge discovery of the structure of Chinese characters.