Various actors, based on the rules established for each place, are directly or indirectly planning, determining and implementing policies related to food, agriculture and rural communities. When this "agricultural policy system" tries to achieve its policy objective, the policy system is influenced by the other policy systems. This article discusses conceptually how the other policy systems, especially the international trade policy system, the fiscal policy system, and the decentralization policy system, could interact with the agricultural policy system. Furthermore, the article tries to understand what the major constraints are that the agricultural policy system is facing and its future directions.