It is necessary to study Economic For Systems Of Field Irrigation the production of onion in Reclaimed Soils in Fayoum Governorate, The study has adopted a descriptive and quantitative statistical analysis method A sample of 210 farmers from new reclaimed farms in Fayoum governorate has been tested, The questionnaire has been collected during the agricultural season 2019/2020The findings of the study have indicated the relative importance of the production costs' items of the onion crop and that the total irrigation costs are at the forefront of the variable production costs' items and are estimated at 3297,3 pounds per feddan, at a rate of 30,2% of the variable costs in the drip irrigation system, Having studied the effect of using different irrigation systems on the production costs as well as the total revenue per feddan of the onion crop, it has been found that with respect to the cost of human work when using drip irrigation, the product achieves an estimated savings of about 410 pounds per feddan, at a rate of about 12,7%, As for the cost of the machine work, it has been found that using drip irrigation achieves for the product an estimated savings of about 72 pounds per feddan, at a rate of about 8,5%, With regard to the total revenue, it has been found that using drip irrigation achieves for the product an increase in total revenue estimated at 9973 pounds per feddan, at a rate of about 37,8%, Finally, concerning the net return, it has been found that the use of drip irrigation achieves for the product an increase in the net yield estimated at about 9155,7 pounds per feddan, at a rate of about 61,1%, compared to the flood irrigation system, The production functions have been estimated in their linear and double logarithmic image, Then the image that conforms to the economic logic has been chosen, through which it has been found that the most important factors affecting the Ibrahim et al. FJARD VOL. 35, NO. 1. PP.190-198 (2021)