Park, Cheon-Bae.. 1998. A Study on English Reduplication with Ablaut Phenomenon. Linguistics, vol 6-2, 289-307. The purpose of this paper is (i) to investigate English reduplicative words, especially the ones that are considered to involve Ablaut phenomenon, and (ii) to give an explanation to the phenomenon in the light of Optimality Theory, or more specifically Correspondence theory, which views it as word-formation based on interactive constraints rather than on ordered copying rules of Standard Theory or Autosegmental Theory. This paper concludes that the essence of the phenomenon is that reduplicative elements are prefixed or suffixed in the obedience to ALIGN constraints, and also that the vowel pairs in those words can be nicely explained by the interaction of ALIGN, POLARITY, and IDENT-BR constraints. (Wonkwang University)