ABSTRACT The doctrine of separation of power and checks and balances in principle can be applied in a presidential system of government as a real son and only child of the doctrine of separation of powers, because outside the presidential system of government, the power of the institutions of power tend to be model of power sharing. Constitution of the Republic of Indonesia in 1945 claimed to carry system presidential administration. The consequences of the choice of a presidential system of government, the application of separation of power in which checks and balances spirit was necessary.RI State Constitution of 1945 explicitly have separation of power in each of the executive, legislative and judicial. However, in line with the Region...