Social sustainability is one of the pillars of sustainable development for communities and has been included in recent theoretical and experimental studies and discussions on sustainable development in a limited way. This paper aims to fill part of the gap resulting from the lack of studies on this aspect in the field of architecture and the development of new communities in a sustainable way، by studying and analyzing the standard of security as one of the components of social sustainability in new cities and its impact on enhancing a sense of belonging to the place. The paper assumes that prevention of risk is a fundamental concept of social sustainability، as contemporary risk conditions resulting mainly from economic conditions have led to an increase in crime rates in new cities and the consequent serious social and spatial repercussions of contemporary human societies and areas living in it. As part of sustainability، we suggest that social sustainability seeks to address social concerns as a result of different crimes by using environmental and urban design methodology CPTED "crime prevention through environmental design". This was done by analyzing one of the neighborhoods of New Cairo، which was developed by the efforts of its residents and achieved some of the criteria of CPTED method used in the study، using qualitative، quantitative method، through interviews، study the area and analyze the responses of the questionnaire directed to the population. That done to study coloration that links statistically between the achievement of security and a sense of belonging، which showed the presence of strong positive correlation semantics for some criteria such as the role of street lighting and the guards to achieve security in the case study، and its impact on increasing the sense of belonging، the study also showed negative relationships of housing ownership on the sense of belonging. Finally، the paper suggested simple method to achieve a crime reduction approach in new cities.