The informal housing subject in Syria has becoming ailment and attention for government and academy sectors, that statistics refer to increment in area informal housing, that with inability solution in stopping the informal march. So that, the research goals to define the economic and social structure for families in informal housing areas, and study the economic and social characteristics and relationships in this structure. The research founds that there is significant statistical relationship between the economic and social characteristics. The research founds too the economic and social structure for families in informal housing area that consist of two factors. First factor is economic factor which correlate with seven economic variables are: monthly salary for families, person part of salary, percentage of family spending on food, percentage of family spending on health care, percentage of family spending on education, family owners of capital asset , number of new merchandise having family. The second factor is social factor which correlate with four social variables are: characters of house family, number of basic associate in house, percentage of family spending on house. Family educational grade.