This thesis is an aerodynamic study of nasality and nasalization in Taiwanese Mandarin, with special reference to the following topics: i) nasality of nasal consonant and ii) contextual nasalization of vowels. In addition, the experimental results were compared with those of Mandarin Chinese and Taiwanese Southern Min. It appears that there are still some notable cross-dialectal differences. Finally, our results may also shed light on the disputed patterns of place neutralization in nasal codas in Taiwanese Mandarin.