Due to its geography,the Korean peninsula is deeply influenced by traditional Chinese culture, becoming an important member of the Characterusing CulturalCommunities in the East Asia.Dictionaries like Erya and Shuowen had been very popular in the Korean peninsula. This paper will use historical documents to track down the history and means of Eryas disseminationon the Korean peninsula and discuss the influence of Erya studies in primary education, imperial examination, dictionary compilation, writing as well academic studies there.We find that the ancient Chinese dictionaries have played an important role in the exchange and construction of civilization among the Chinese Characterusing Cultural Communities.