This study aims to investigate the vocal factors that affect the results of audience’s evaluation in public speaking. For this purpose, 46 college students were asked to deliver a speech and their speeches were assessed by the audience of their fellow students. I examined the articulatory and prosodic characteristics in the recorded utterances spoken by 12 speakers(6 highest scorers and 6 lowest scorers in audience’s evaluation). The results show that there are significant differences in their speaking rate, mean length of utterance, silent pause ratio, IP boundary and AP tone pattern between the two groups. The results of this study provide basic data for the preferred expressions in speech, and can be utilized for developing an education program to improve speech skills.