There are differences in allusion word type between handed down documents and unearthed documents which always go through the process of morphological diversification. Then take 3 allusion words in the epitaph as examples to introduce. First, the common allusion Longquan (龍泉) in the epitaph in Tang dynasty use the factual allusion pointing to the death meaning words by figurative rhetoric. Second, the idiom Zhang Shang Ming Zhu (掌上明珠) use up to now Which exist two typys Weizhu (韋珠) and Zhang Zhong Zhu(掌中珠), however Weizhu (韋珠) is the illusion origion. Third, word example in poems Hanshu (寒樹) pointed to trees in autumn derive the sad meaning in the past dynasties, which influences the comtemporary understanding including annotation in Chinese textbooks nowadays.