漢字異體孳衍繁盛,數量眾多,「異體字字系」為整理異體字之新觀念,指將一字之異體依其變化特徵分系。其法乃藉由分析異體變化中之關鍵元素,將其立為「系首」,並釐析出相關異體字形置於系下,以統整諸異體變化,進而掌握一字異體之端緒。本論文以異體字中「形聲字」之「形符變換」為主題,結合「異體字字系」觀念加以探討。討論對象以《說文》所載形聲字為主,再以教育部《異體字字典》所收異體字為例,擇其形符變換而可獨立成異體字字系者,加以分析其來龍去脈。並藉此闡發「異體字字系」之建立,除有助異體字字形考釋外,於形聲字形符變換之研究,亦有其價值,而分別就「字義」、「正字體系」、「造字法」、「文字演化」、與「造字心理」諸角度,予以說明。
Because large number of Yiti (異體,Nonstandard forms of Chinese characters), therefore, to find out the "keyword of font change" is really necessary. This research project attempts to establish a "keyword of font change "concept in "Semantic radical" change type on Yiti. The "keyword of font change" can connect the other Yiti. And to further explore related issues.