The article proves that managerial impact in the form of socio-economic projecting in the best way suits the task of integrated solutions to the problems of socio-economic development of a large city in the situation where it is supported by implementing differentiation of urban areas by the preparedness of city people to innovation in the social sphere, carried out by municipal administration. For social projecting in terms of a large city, distances within the level of well-being of social groups should be linked to the division of city on a territorial basis (into urban areas). It is displayed that socio-economic development of a large city can be achieved with a combination of programtarget approach to developing a strategy for such development together with the principles and technologies for socio-economic projecting. Optimization of administrative activity, based on the projecting socio-economic development of city, leads to a gradual increase in the volume and quality of social participation of city people in the implementation of city-wide strategic development programs.