In Cairo communities, it's noted that there's no concern for the Social Urban Spaces in the low- income communities markets. They do not even exist at all in the design program of the market in spite of their importance in achieving social sustainability. The problem of the research can be summarized in the design of the low-income community markets to achieve the largest quantity of the sale and purchase units, without recognizing the market value for the community as Social Urban Spaces that are important for the achievement of social sustainability. The research aims at understanding and analyzing the low-income communities markets in terms of types, components, areas and activities, and then deducting the system of Social Urban Spaces through relating them to the market areas as a tool for achieving the social sustainability in the low-income communities markets.