位于朱雀门外东侧的“无字碑”，高6.3米，重约98.8吨。碑侧线刻龙纹，碑头刻有8条螭身相交。为什么立一通“无字碑”呢？有人说，武则天是想让后世的人对她做出公允的评价；有人则说，武则天觉得自己功德无量，是无法用语言文字来表达的；也有人认为此碑可能是唐中宗所立，他不满武则天的独断专行，不愿违心地恭维她，但作为一个儿子，又不便对自己母亲提出非议，因此立无字碑让后人去评论。不管怎么说，在帝王陵前立无字碑在我国历史上确实是独一无二的。现如今发现的石碑上刻有不少文字，为宋金后人所刻。

Located to the east of the Zhuque Gate，the Wuzi Tablet is 6.3 meters high，and weighs 98.8 tons.The sides of the tablet were carved with figures of dragon.The top part of the tablet was carved with eight oysters intersecting each other. Why was the Wuzi Tablet set up for Empress Wu Zetian？Some say that she want－ed people of later generations to give her a just and fair appraisal. Others say she thought that her merits and virtues were so immeasurable that they were beyond words.Still some others think that it was probably set up by Emperor Zhongzong，who was dissatisfied with her arbitrary decisions and peremptory actions and unwilling to flatter her.But as her son，it was inappropriate for him to reproach her.So he set up the Wuzi Tablet to let people of later generations judge her.Anyway，such a tablet has not been found before any other imperial mauso－leum in China.There are many characters carved in the tablet which were completed by people after the Song and Jin dynasties.