Purpose of Study: AS EAN countries have entered into the free - market era, based on AEC Agreement in 2015. This ASEAN free market system will certainly stimulate business competition among the members. Therefore, ASEAN needs competition law and competition authority to foster h ealthy competition among businesses in the ASEAN area. This research focuses on; first, that ASEAN members need to develop and harmonize the Competition Law existing in each country; second, ASEAN members need to set up the Competition Authority to enforce the implementation of the free market system