Urgency of the research is determined by the necessity to introduce new instruments of social policy and social security implementation. Target setting. Social entrepreneurship could become a tool for developing effective social policy and social security of Ukraine. The introduction of social enterprises will provide new jobs, enhance adaptation of vulnerable population groups reduce budget expenditures for social protection. However there is still a problem in determining the basic preconditions for its formation. Actual scientific researches and issues analysis. The approaches to the formation of economic, institutional mechanisms to ensure security. Uninvestigated parts of general matters defining. Insufficient attention is paid to the development of domestic models for the formation and functioning of social entrepreneurship. The research objective. Refinement of social entrepreneurship models taking into account domestic conditions for ensuring social security of the population. The statement of basic materials. The article deals with the social entrepreneurship models substantiation approaches. Specified models are substantiated in accordance with the functional features of social enterprises formulated by the authors in the context of providing social security of the population. Conclusions. To determine the procedures and rules for starting social enterprises, it is important to develop models for their formation. The is to put the following criteria should be basic for identifying social enterprise models: organizational; by sources of financing; by the composition of the contact groups; by mission or purpose. Identification of social entrepreneurship models makes it possible: 1) to orientate on possible directions of activity; 2) reflect these trends in terms of state or regional social policy; 3) clearly define the criteria for social entrepreneurship at the legislative level.