In this study, nearly 600 speech error data were examined to explore the syllable internal structure of Taiwan Southern Min (TSM). Results showed that a great majority of speech errors reflect an onset-rime branching structure. As for the other piece of evidence, syllable contraction data, which was used as a supporting argument for the body-coda structure, we provided an alternative analysis without involving the break of the sub-syllabic constituents in phonological joints. Thus we argue on the basis of speech error data that the syllable structure of TSM is onset-rime, consistent with the traditional concept.