Yang Xiaofeng (2004) considered that the word tone is the carrier of intonation, and there is word tone and sentence tone. In this sense, word tone restricts sentence tone. However, word tone and intonation are two relatively independent word linguistic flat, that is to say, the word tone does not restrict the formation of intonation and not affect the internal structure of intonation. Changes of the word tone might bring subtle changes on shifting, increasing and domain of sentence tone, but not bring effect on the overall trend and volatility shape of the tone scale. Therefore, it can be said that the word tone has non-obvious influence on sentence tone. 信息焦点对日常话语理解影响的语用实证研究(3):http://www.751com.cn/yingyu/lunwen_14225.html