The maize crop is one of the main grain crops in Egypt after wheat. It is used in human consumption and many industries. The study aims to study the development of production capacity and the most important cost items for the maize crop in Ismailia Governorate during the period (2000-2021), and to estimate the total costs function to identify On the quantity of production that maximizes the profit and the quantities that minimize costs in order to determine the position of the Governorate in the production of the crop, as well as the indicative relationships of the net  yield and the factors affecting it. Using some statistical analysis methods for estimated them  . the study showed that there was a significant increase in productivity and  total production . while there are no significant in cultivated Aria of the maize crop in Ismailia Governorate during the period (2000-2021).  By studying the economic indicators of the crop, it was found that there is a general time trend increasing annually and statistically significant at 1%  a level of significance for each of the annual average of the farm price, the average value of the total revenue, the annual average value of the net return, while the time trend for the development of the value of the net return on the invested pound was decreasing annually Statistically significant at the significance level of 5%. and the optimum volume of production that reduces costs for the crop was estimated by about 27.64 ardebs / feddan at the lowest cost estimated at about 6,825.63 pounds per ardeb, and the economic production that maximizes profits At about 35.32 ardebs/feddan, at a total cost estimated at about 985.61 pounds per feddan, the average total revenue per feddan was 4158.44 pounds at actual production and about 8701.44 pounds per ardeb at economic production, at the average farm price of 246.36 pounds per ardeb. The study recommends the need to continue adding productive resources and using optimal combinations in order to reach economic production. And follow the technical recommendations related to the cultivation of modern varieties with high productivity, and pay attention to seminars and extension courses related to the cultivation of the crop in order to raise the efficiency of the productive resources used in the cultivation of the crop in the Governorate.