Chinese Idioms are important as a Part of Chinese Vocabulary, Korean learners who use Chinese as a second language understand and grasp the usage of the Chinese-Korean idiom，It will also play a significant role in learning Chinese for Korean learners. A Comparative Study on Chinese and Korean idiom of same patterns of synonyms provides many conveniences and references for Korean Chinese learners, Nevertheless, there are differences in Chinese and Korean of syntactic, semantic and pragmatic functions of idiom of same patterns of synonyms. Therefore, Korean Chinese learners may have some troubles learning and using Chinese idioms. Dissertation takes between Chinese and Korean idiom of same patterns of synonyms from the new HSK level six Vocabulary Outline and two sets of the new HSK level six official test paper as the research subject, make Research and Analysis on Chinese and Korean synonym idioms differences between using frequency and usage of idioms in Chinese and Korean databases, in addition, make a comparative study between Chinese and Korean of syntactic and pragmatic functions of idiom of same patterns of synonyms, both Chinese and Korean idiom of same patterns of synonyms of the meanings are similar, however there are still many differences.