Abstract: Smalltalk is the most typical object-oriented programming language and environment. In order to implement Chinese character information processing in it, an approach is presented in this paper.Instead of modifying the original Smalltalk system, this approach provides several new classes by which Smalltalk users can not only process Chinese Characters in Smalltalk windows, but also output them in Smalltalk programs. First,the character-displaying principle and window technique of Smalltalk are analysed and then the design and implementation of Chinese character classes are described.