The reunification of South and North Korea may be national hope, which could not be accomplished in near future. However the social integration of South-North Korea should be pursued, in order to progress the reunification steadily. First of all, economic cooperation between South and North Korea should be activated. Through economic cooperation South and North Korea could communicate each other and develop common interest. Under present situation, trade and sightseeing is not freely progressed because of different viewpoint about surrounding political situation. However both partners should overcome the difficulties in order to progress the economic cooperation. Secondly, democracy should be developed in South and North Korea, in order to accomplish social integration. In South Korea liberal democracy has been developed, whereas North Kore is quite different. In order to develop the democracy in North Korea, the political leader should accept reformation and innovation similar to that of China. In South Korea substantial equality in economic and political areas should be attained, whereby discrepancy and conflict in liberal democracy could be overcome. Thirdly, the human rights and economic improvement of the North Korean defectors should be protected. In order to attain social integration in South and North Korea, the law of both partners should be reformed. In South Korea the legal characteristics of South and North trade and travel should be clearly be defined in related laws. The social status of North Korean defectors should be improved in concerned law. The complicated procedure in South and North trade and travel should be simplified in related laws. In North Korea the protectional law of South Korean investors should be newly inacted, whereby the personal safety and commercial interest of South Korean investors should be specially protected. The legal status of South Korean investor should be improved in related law. The reasonal corporate gevernance should be established in law of joint-venture company. The strict legal regulation of labor relation should be overcome through the revision of labor law.