This paper is devoted to the analysis on the systematic characteristics of low pitch, weak intensity, short length, etc., detected in the phonetic realization of information focus in prosodic phrases of interlanguage. Due to the negative transfer of Chinese prosodic type and tone feature, learners had great difficulty in noticing and realizing the pitch range variation of English intonation. And the strong hearing recognition and relatively high pitch of Chinese LH tone tend to lead the learners to realize the information focus as short high rising tone sound like the Chinese LH tone.