The two most well-known Chinese characters dictionaries are Songben Yupian from China and Quanyun Yupian from Korea. These dictionaries contain a wealth of information on Chinese characters at the diachronic and synchronic level, while also retaining much information on Chinese characters during the period of its movement overseas. This paper is a corpus-based study which analyzes the differences in the style of arrangement, phonetic notation mode, interpretation, form interpretation, and other aspects of the two dictionaries, and further summarizes the laws of the development of Chinese characters in overseas dissemination. The result of this study indicates that the function of the two dictionaries is different, that the Chinese characters remained stable during their transmission to other countries, and that the overall trend in the evolution of the characters is toward simplification, and that the main way that Chinese characters morph extraterritorially is via phonetic and semantic replacement.