《说文》大小徐本“一曰”别义说解常受诟病。本文通过逐一对比研究,发现《说文》最早残写本——唐写本《木部》残卷与大小徐本《木部》对应字的正训与“一曰”之别义训解基本相同,说明唐写本与大小徐本总体保存了许书原貌,且有互补,毋庸质疑。 “Said the text,” the size of Xu “One Day ” definition of meaning is often criticized. This article through one by one comparative study, found that “Shuo Wen,” the earliest written version - the Tang version of “Wood” residual volume and size of the “wood” corresponds to the word of the letter of the word and The same, indicating the size of the original and the size of the book of Xu Xu preserved the original book, and there is complementarity, no doubt.