Vocabulary is the most rapid development of the language elements, the word is also the same with the times. From the perspective of the history of vocabulary, it is more scientific to study the language of Yan Danzi than "Ci Qi", "Wen Ci" and so on. A part of Yan Danzi's vocabulary is not found in the books of the pre-Qin Dynasty, but only after the Eastern Han Dynasty, and the other part of the vocabulary is found in the literature after the north and South Dynasties. From the perspective of the vocabulary history, Yan Danzi language time certainly do not belong to the Western Han Dynasty before should be finalized in Six Dynasties period.