The development of reduplication words have been universal linguistically. However, the realization of reduplicated words in many languages are peripheral or unique. As for Korean, there are over 4,000 symbolic words and excluding these words there still exists many reduplication words that are actively used, which shows that reduplicated words are used frequently. In this study, the definition of reduplication words were not limited to words, morphemes, but also, reiterated syllables and foots. In this aspect, this study arranged the list of Korean reduplicated words in the 17th century and examined the characteristics. First, externally, the reduplicated words of the 17th century was generally brought as full reduplication. When the reduplicated word combines with a different affix it was most frequently combined into ‘-hada’ and ‘-i/hi’ Especially, when it combined with ‘-hi’ it combines with an one syllable repetition type. When making a new word with reiteration, it mostly likely to be an adverb. The meaning of reiteration serves as [repetiton], [plural] [all], [emphasis]. (Konkuk University)