通过对敦煌变文中的助动词“能”穷尽性描写和历时比较,可见古代汉语也已产生的助动词“能”的基本意义在敦煌变文中继续使用并延续到现代汉语;引申意义变化较大,古代汉语所没有的表“某种用途”、“情理上许可”等意义已在敦煌变文中使用,而现代汉语助动词“能”表示“环境上许可”的义项尚未出现。敦煌变文中的助动词“能”不仅继承六朝以来形成的“助动词+VP+不”的反复问句式,而且具有了现代汉语反复问句结构的“～不～”式。 Through the exhaustive description and diachronic comparison of auxiliary verbs “can ” in Dunhuang anthologies, it can be seen that the basic meaning of auxiliary verbs “can ”, which have also been produced in ancient Chinese, continues to be used in Dunhuang discourse and extends to modern Chinese; The meaning of “some use”, “implied permission” and so on has not been used in Dunhuang bibliography, and the auxiliary meaning of “modern” The meaning of the item has not yet appeared. The auxiliary verb “can ” in Dunhuang anthology not only inherits the repeated questioning pattern of “auxiliary verb + VP + not ” formed since the Six Dynasties, but also possesses the pattern of repetitive question structure in modern Chinese.