Based on the study of the vulgar in the ancient manuscripts of the Annals of Three Kingdoms'(三国志)which unearthed in Dunhuang and Turpan, this paper discusses the cause of prosperity of Manuscript' vulgar in the period between Wei & Jin Dynasties and Southern & Northern Dynasties, from the following three aspects: Social and historical reasons, self -evolution of Chinese character and userg cognitive factors.%以敦煌吐鲁番出土《三国志》古写本俗字研究为基础，从社会历史原因、汉字自身演变以及使用者的认知因素等三方面对魏晋南北朝时期写本俗字的兴盛原因略作管窥。
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