Egypt's water resources will be reduced in the future because of the region's climate, regional and political changes, which will consequently affect Egypt's Water allocated to agriculture, which reaches 61.5 and accounts for about 85% of the total  water resources of 74.4 billion m3. Therefore, it was necessary to carry out this study, one of the most important objectives of which is to develop different scenarios for crop structures that reduce the negative effects resulting from the future exposure of Egypt to water shortage expected. The non-linear programming method was applied to determine the optimum crop of reach the best efficiency water use in irrigation, where three scenarios have been formulated for different crop structures when Egypt is exposed to water deficit estimated at 12, 18 or 24 billion cubic meters of water, including both Nile resources and agricultural wastewater. omposition according to the objective of maximizing the yield of the water unit. The presence of negative effects on the Egyptian cropping structure as a result of a deficit in water resources ranging from 25-50%, which leads to a reduction of the cultivated area of ​​winter, summer and Nile crops, which affects the reduction of total crop area by 20-40%, which leads to a decrease in yield of agricultural production The total is about 18-38% and this leads us to take the necessary measures to reduce that problem.