The taboo system in the Song Dynasty was very strict, correspondingly, the academic notes of Scholars in the Song Dynasty also have a lot of taboo studies. These taboo studies have recorded a wealth of taboo materials of the past generation, which has high data value. Some of them are also good at textual research, and thus benefit the study of the later periods.But most of these studies Only record taboo materials and lack of innovation. Scholars are good at the induction of taboo materials and ignores the application research and theory construction of taboo. The reasons of taboo studies in the Song Dynasty have developed include cultural environment, the severity of the taboo in the Song Dynasty,and the adaptability between the notes genre and the characteristics of the Scholars’ taboo studies.

Taboo is an ancient custom in China. The taboo system was applied to the names of emperors had a long history in China. Beginning from Zhou Dynasty, until to Qing Dynasty. It is true that taboo system has caused confusion of the recording of ancient Chinese books and inconvenience to the study of historical materials, but one will be able to apply its principle to appraise the authenticity of those books and materials of one has a good grasp of it. Taboo studies also have a long history. According to Chen Yuan’s陳垣 Shi hui ju li史諱舉例，there are different ways to avoid the forbidden words, such as change the character, blank character, omit a stroke, change the pronunciation, etc. This paper claimed that besides change the forbidden word to a synonym, other ways to achieve taboos were occurred in Han Dynasty, such as “missing one stroke of a Chinese character”, “change the formation of a Chinese character”, “change the shape of a Chinese character”, etc. That means the old conclusion of Chen Yuan and other scholars may be not true. However, philologists argued that those changes are the result of the variant form of a Chinese character異體字. Scholars stated that the way to avoid a tabooed word in Han dynasty was to change the forbidden word to a synonym. In this paper, according to Louji’s 婁機 Hanliziyuan漢隸字源, Hongkuo’s洪适 Lishi隸釋, Zhou Guangye’s周廣業 Jing shi bi ming hui kao經史避名彙考, we examine the relationship between tabooed character and variant form of a Chinese character. Finally, discuss the importance of variant form of a Chinese character in the aspect of taboo studies.