Abstract: The study of residential slums in the holy city of Najaf considered as an extremely important issue for the great impact that it holds on the human life and his various activities and events. This influence reflected directly on the infrastructure system services which led to the weakness of its functional efficiency as well as their insufficient to the needs of the population. The reason for the spread of residential slums was due to several factors and reasons that helped them to form and grow, despite their negative effects, especially, infrastructure services such as transport routes, health, education and electrical power which led to the inadequacy of the population from the system service.