Green areas and open urban spaces consider vital elements in the urban planning levels due to its aesthetic and economic values. They are the lung of cities. The plant belt considers also an important element from the natural life elements and it achieves the environmental equilibrium. In fact, Cairo suffers a lot from the clear shortage in green areas inside the residential districts. And it is noticeable that the existing green areas did not achieve its effect environmentally or socially especially in the high capacity inhabited residential zones. As a case study, the zone surrounded the mosque of Sayda Zainab will be analyzed to examine this problem.