This paper investigates the prosodic features that can disambiguate polysemous sentences in Mandarin Chinese and confirms the results of the acoustic investigation by means of a series of perceptual experiments using synthesized speech stimuli. Judging from the results of both the acoustic and perceptual experiments, it is concluded that a pause and stretched word duration before a syntactic boundary are the two primary prosodic cues to disambiguate polysemous sentences in Mandarin Chinese.