This article provides a comprehensive analysis of the role of public administration in the effective implementation of the principle of separation of powers. The problem of rational balance between parliament and government in the system of state power is relevant today. The relationship between the legislature and the executive is an important tool that directly affects the form of governance of each state. According to the author, the control and interaction of the branches of government without acting as an observer is important in the implementation of the state mechanism, but in the process, the branches of government must exercise their powers independently. The author also divides modern models of these relations into the following types depending on the principle of separation of powers and the principle of mutual balance and restraint: presidential, parliamentary and mixed. Analyzing the best practices of foreign countries and the approaches of legal scholars to the form of governance, given the specifics of the form of governance of the Republic of Uzbekistan in terms of functions, tasks and powers of the branches of government and the level of responsibility and mutual control.