International system is a strategy which explains institutions power and behavior in international relations. It has two dimensions: structure referring to the distribution of capabilities among units and process refers to patterns of interaction among units. According to the types and history, International power structure was multi-polar till the end of World War II and then it transformed into a loose bi-polar in Cold War, now the world is moving towards new world order due to the rise of new economic and military powers at the world stage and regionalist trends in global politics. US hegemony is facing multiple internal and external challenges. Factors supporting multipolar future are the rise of BRICS, new regions and non state actors differentiating world into major, middle and small powers. In future international power structure, regionalism will gain strength, military power will be subordinated to economic power, states will neither be permanent friends or foes as they will compete and cooperate at the same time and international anarchy will provide opportunities to states to replace one another top hierarchical position.