The description of the nature of Korean - Chinese interlanguage is a very useful way to understand the situation and characteristic of Chinese learning by Korean learner. Korean ？ Chinese interlanguage represents linguistic characteristic of Korean learner, which is related to the various elements of mother tongue (Korean) and Chinese learning of learners. In the aspects of pronunciation, the most remarkable characteristic of Korean learner is a pronunciation that is mainly focused on segments, which is closely related to the fact that Korean is not a tone language. Korean elements are mixed in the rule of sound change and pronunciation of partial consonants and vowels. In the aspects of vocabulary, its systematic character is relatively weak but it has characteristic coming from Korean. Some are substituted by Korean words, some are Korean way in meaning and function and some are due to the complexity of Chinese words. In the aspects of grammar, interlingual interference is negative transfer that is caused by the rule of word arrangement in the Korean sentence which has elements like object and complement etc. The interlingual interference results from the syntactical complexity of Chinese elements like complement, liheci (？合？), cunxianju (存？句) and so on.