In recent years, Korea-China FTA discussions are becoming active. Because the trade structure between South Korea and Taiwan is very similar, the study on ECFA and South-North Economic Cooperation will be able to give many implication to us. The the relationship between Mainland of China and Taiwan government and the relationship between South and North Korea government has historical similarities. But some differences in terms of legal, political are worth noting. Latest, because cross-border trade of the North Korea and China is becoming more active, the relationship between South an North Korea may affect by Korea-China FTA concluding. Thus, we have to consider economic and legal issues when conclude Korea-China FTA or Korea-Taiwan FTA through a comparative study on ECFA and South-North Economic Cooperation. Cross-Strait relations and Inter-Korean relations have a lot of similarities on history and culture, but economic scale and legal concepts are different. Whlie South-North Economic Cooperation is the agreement of inter-transaction,on the other hands, ECFA has not such article. And, each agreement statement is showing diffent of the nature and structure of Article. ECFA has the legal characteristics of the FTA including a significant portion. We have to conclude FTA through a comparative legal sutudy on ECFA and South-North Economic Cooperation for the North-East Asian stability and the economic profit of Korea.