Korea-China FTA on Dec. 20, 2015 has been the entry into force. As a result, the 10 trillion won China market preoccupancy and about 10-year 0.96% of economic growth effect are estimated. The South Korean government announced that it immediately appears its effect from 2016, because it has taken effect the end of 2015. However, effect of the slowdown in growth of the Chinese economy and the ultra-low oil prices, South Korea's exports to China in January 2016 decreased by 21.5% year-on-year. There shows that the appearance similar to when the global financial crisis in 2008. Such a phenomenon, not just a matter of slowing growth Chinese economy and the ultra-low oil prices, it is not possible to also eliminate the effect of changes in the Korea-China trade structure. Results of the measurement of the trade complementarity of the two countries intensity of trade can determine trade structure that Korea-China trade complementarity was found to be mutually competitive for gradually decreased. Such a change is determined to have an effect on the two countries of the trade, the analysis of the Korea-China FTA concessions using intensity of trade can be seen as providing a new suggestion.