The study of “The role of the royal Thai Army in Security and Economical Interest Management: A Case Study of Thailand – Myanmar Border”, were conducted due to the rapid change in Thailand-Myanmar border, which transformed from the army security area to the center of trans-border economy. The change as such created more intensive cross border activities. It boosted international economy value; by the way, it also boosted the new security problems, such as drug trafficking, illegal migrant workers and deforestation. Royal Thai Army, as the main organization who manages the border area, had to extend their role to handle with new security problem. However, the army that gave first priority in protecting sovereignty over the land is not well accepted by other organizations and local people. It’s because these groups gave first priority to economic growth rather than security and there was also inadequate integration between organizations.