The international co-production is suggested as an alternative to expand market size. Its advantages are the ease with raising funds, combining the advantages and know-how of participants, and the sharing of the market and the result of exploiting a new market together. The purpose and meaning of the international co-production is to make qualified and high-budget film which one can not make on one’s own, by sharing and combining a ‘budget’, ‘human resources and know-how’, ‘information and material’, and ‘motion picture technology’. It is divided into three groups by the stage in which the cooperation is made in the programme process. The first group is co-financing, which means making film by working out a plan for financing together. Normally it is the most common form in co-production. Second one is co-production, which is sharing financial partnerships and processes like plan and producing. In this case, there can be many problems including cultural differences, production systems, and sharing responsibilities between two countries because the production process is shared by two countries. Third one is co-venture, which covers above-mentioned two groups. Generally co-production means the second one. This research suggests the international co-production as a solution to improve Korean film industry getting worse by determining the fundamental cause. Furthermore, it is planed to make a manual for the practical process and the theoretical background of the international co-production. Therefore this research focuses on analyzing the problems about co-production circumstances in Korea and around the world, based on the concept and the definition of the international co-production, the history of the international co-production in America, Europe, and Asia, and the structure and the nature of a world film market.