The social most endanger inhabitants in Belgrade is the ethnic group of Roma. Social isolation, ghetto lifestyle and deficiency interest of Roma population for overall social development, in relation with other contents of Roma ethnic culture, makes definite influence on different aspects of their life. Residential problems in Roma population are the most evidence form of their misery. The attrition process and addition number of households, as one of indicators of modernization, stream slow and show correlation dependence between caste and residential problems. According to final results of Census in 2002, the largest concentration of declare Roma was in Belgrade (total number was 19.191 apropos 17.7% in total Roma population in Serbia). Percent stake of single and binomial households in total number of Roma households in Belgrade was 24.7% in regard the same stake on Belgrade level (47%). More visibility differences are in five to ten members' households; in Roma population stake was 38.8%, plural more than same stake on Belgrade level. Research results of Roma population in Belgrade come into view family mode organization, thus 62% Roma population in Belgrade lives in extended families. Other kinds of family organization are cognizable only in fragments or in modify types where family relationships don't import collective households. .