Sustainable urban development (SUD), environmental sustainability (ES), sustainability of developing cities (SDC).

Sustainable urban development (SUD) is influenced by social, cultural, economic and environmental sustainability (ES) of developing and developed countries. Our paper will focus on the challenges confront the developing countries in sustainable urban development an application will be on Egypt, which will clarify current situation and future challenge will assess the impact of sustainable development on developing country to propose some possible directions for the future .A new solution of improving sustainability of developing cities (SDC) should be found.