Abstract: In ancient china,there was the fixed form for the ancient grammar,which was obeyed by people automatically in practice.At that time,with the primary notion of grammar,Zheng Xuan had explored the ancient grammar consciously.The grammatical notion in Zheng Xuan s The commentaries and annotations on Mao s poems is prominent,in which there is not only the explanation of the language structure,the discussion of the order of language,but also the accurate division between notional words and form words,and the cor...