Abstract: Two parts are included in this research. In the first part, by investigating the duration cues of 4 words in 148 sentences which are read loudly by 10 speakers, the results showed that (1)when sentence prominence emphasizes on some word,the duration-lengthening mainly localized on the stressed syllable of the word; (2)when sentence prominence emphasizes on some syllable of a word, the duration-lengthening mainly localized on the syllable. In the second part, we have, by perception experiment with the above sentences, found that the sentence in which sentence prominence emphasizes on some word and the sentence in which sentence prominence emphasizes on the stressed syllable of the word can replace each other respect of their contexts，which results from the resemblance in acoustic cues of these two kinds of sentences

Key words: sentence prominence, duration, stressed-syllable