寫本由於是古時文字書寫的實際樣貌，在異體俗字的研究上有其不可取代的存真價值。因為這種以真實材料為憑藉的研究，較能真切的反映出當時的文字使用情況。本文之作，以敦煌寫卷S.388號為中心。加以採錄其中的異體字，並且以部件分析的方式來歸納其中異體字。進而與唐代字樣書中所載的俗訛字來作深入的比較。文末並附上「寫本異體字部件形體變異表」。一方面希望藉此以見寫本文字在存真價值上的優越性及複雜性，另方面則希望從中以明其與字樣書所載俗訛字中的具體差別。就瞭解字形的變異及文字的演化、載體的文字特色等方面而言，本文或可提供些許參考價值。

Handwritten is the concrete appearance of ancient Chinese writings, so that it has identified real value in researching variants of folk characters. To reflect more true circumstances on using words, we ground on studying these references. This study aims at using the Chinese character variants in Tunhwang Handwritten Chinese Vulgar Words S.388 to analyze the variants through the way of radical analysis and to generalize its variants. Moreover, we compare the variants with the Tang Dynasty's typographical errors in depth; and the study is appendixed with "The Form about Variations of Structures and Radical of Character Variants in Handwritten." We will present the ascendant and profundity of real value in handwritten, on the other aspect, and also appear concretely the differences between the variants and typographical errors. On the dimensions of realizing the character's variant, evolution and the feature of Chinese character carriers, the thesis might be valuable for reference.