Abstract:  
This article substantiates the relevance of school self-government in the modern system of education. The subject of this research is the interconnection of the school self-government with the formation of social activeness of the students. It is noted that for establishment of the social activeness among teenagers, it is necessary to comply with the following conditions: realization of personally important goals of social activity; choice of acceptable forms of such activity and personal participation in it. The author conducts the analysis of separate models of school self-government: “School Council”, “Game State”, “Democratic Republic”, “Alternate Day”. The article demonstrates the adjusted model of school self-government – the “School Republic”, its structure, stages of development, and functionality, as well as analyzes social activeness of the students at each stage of the evolution of school self-government.