Chinese writing system is not only used by Chinese but also used by Japanese. The motivation of this paper is to extend the architecture of Hantology which describes the features of Chinese writing system to integrate Japan Kanji into the same ontology. The problem is Chinese characters adopted by Japan have been changed, thus, the modification of the original architecture of Hantology is needed. A extended architecture consists orthographic, pronunciation, sense and derived lexicon dimensions. is proposed in this paper. The contribution of this study is that the extension architecture of Hantology provides a platform to analyze the variation of Chinese characters used in Japan. The analytic results of variation for a specific Kanji can be integrated into Hantology, so it is easier to study the variation of Chinese characters systematically.