Abstract: A word has different meanings in different context. Its meaning can be fixed in a specific sentence. This can be summarized as a principle of “different meaning,different order”.Therefore,it is the distribution of a word in a specific sentence by which the part of speech,the specific meaning,etc.of the word can be determined.The steps are:summing up the pattern by the examples from the ancient books,then fixing the meaning of the word through the pattern.The paper studies 8 am biguous words and sentences in Lun Yu(the Analects),Mencius and Han Shu according to this principle and the steps.