National standard codes such as GB 18030 is the national standard of Chinese character coding in China, and UTF-8 is an international character encoding. In the internationalization, these coding methods exist simultaneously in Chinese information processing environment. In order to be compatible with the existing systems, such as document and protocol Chinese characters processing, the newly developed information system must convert the Chinese characters in the above form. In this study, the common Chinese character coding standards are introduced, and a Chinese character coding conversion program for lightweight applications of information system is described in detail, which supports the reuse of cross-operating system platforms.