Building border areas is a government duty, including the local government. Conditions at the border area require continuity of acceleration so that it really becomes the front porch of the Unitary Republic of Indonesia. It takes approaches in doing so, such as welfare and security approaches because the guarantee of security in the border area will lead to conducive development. To implement such approaches in the framework of development at the border area, synergies between the local government and Indonesian National Armed Forces (TNI) through Kowil Officers of border areas is required. Therefore this paper focuses on how the synergy between the Regional Government and the TNI Kowil Apparatus in developing the NKRI-RDTL Border Area. The research method used is qualitative method with literature study techniques or literature review, documentation and other descriptive techniques. The results show that the synergy between the local government and TNI has a high urgency to do. Synergy can be done through collaboration in the implementation of tasks and functions as well as cooperation, especially in the implementation of infrastructure development involving the strength and potential of the Regional Command Apparatus either through involvement in aspects of human resources and infrastructure facilities in various activities bhakti TNI or in activities which then synergized by the government area. The synergy of the development in the border area can be achieved optimally so that in the end can improve the welfare of the people integrally while supporting the performance of the local government and the TNI itself as an integral part of the Unitary Republic of Indonesia.