Traditional Arab Islamic urbanism has been ignored for decades, and Arab architects have been unwilling to revive traditional features and they are complying with the new urbanism movement. Since the late nineteenth century and the beginning of the twentieth century, the style of big Arab cities has become substantially westernized, historic Arab cities transformed from traditional to modern Western urbanism led to a loss of Islamic cultural identity, many factors led to the transformation of the urban structure of these cities including social, economic, legislative and functional which leads to loss of local identity by introducing new architectural and urban forms. This paper will focus the scope of study on old Islamic Cairo, Khedivate Cairo and The New Administrative Capital (NAC) and will analyze the transformation happened to the urban structure using the comparative analysis methodology to reach the research aim and know why the conventional urbanism of Arab Islamic cities has been ignored? And also to show how other Arabic cities like Doha in Qatar and Masdar in UAE tried to overcome the same problem by using the contemporary interpretation trend.