In terms of Greater Cairo history, a lot of problems, were appeared, they are mainly related to the random extensions and informal housing, high population density, over crowded streets , high rise buildings( instead of low rise ones) , and informal areas All these reasons are sufficient to encourage environmental damage and failure of Cairo infrastructure, all these factors lead all researchers to direct their studies to solve all interacting problems of Cairo urban region. Therefore the absence of good following for urban laws (which guide urban growth) represent another factor of Cairo problems. In this framework the idea of this study was done, It was directed to stop urban extensions on the agriculture lands around Greater Cairo area through the best scientific planning of Greater Cairo region. Research Methodology :- As a result of the comprehensive position of Greater Cairo plan “which related to all problems discussed before,” it is essential to put an elastic methodology to be able to consider all problems mentioned above. Therefor it is possible to find the best way for stopping informal extensions of the city on agriculture lands. The following diagram shows the Research Methodology .