本文以大量例证，指出唐代避讳在我国整个封建社会中是最不严格的，造成这种现象的原因，与当时宽松的政治思想氛围有关。由此可知，“玄元之妙”中所谓唐玄宗以后，所有书写“玄”字的地方，一律要改写作“元”字，以免犯“大不敬”的忌讳之说，难以成立。 This article uses a large number of examples to show that the taboo in the Tang Dynasty was the least stringent in the entire feudal society in our country. The reason for this phenomenon was related to the loose political atmosphere. From this we can see that after the so-called Emperor Xuanzong in Xuan Yuan Miao, all the places where “Xuan” is written must be rewritten as “Yuan”, so as to avoid the taboo of being “disrespectful” and difficult to set up.