The research showed the cost functions of winter crops the first category that the optimal size of an acre of clover and wheat was about 37.3tons, 23.19ardab, while the maximum profit size of an acre was 51.06tons, 42.28ardab, as the summer crops in category that the optimal size of an acre of rice and corn was about 5.01tons, 28.37ardab. While the maximum profit per acre was about 5.64tons, 35.96 ardab. By studying the cost functions of winter crops in the second category, it was found that the optimal size of acre of clover and wheat was about 43.51tons, 25.63ardab. While the maximum profit per acre was about 56.12tons, 27.93ardab, as the summer crops in category that the optimal size of an acre of rice and corn was about 6.11tons, 21.41ardab. While the maximum profit per acre was about 46.47tons. As for the maize crop, 23.78ardab. By studying the cost functions of winter crops in the third category, it was found that the optimal size of an acre of clover and wheat was about 21.84tons, 22.3ardab. While the maximum profit per acre was about 33.67tons, 22.83ardab. as the summer crops in category that the optimal size of an acre of rice and corn was about 3.87tons, 24.43ardab. While the maximum profit per acre was about 9.82tons, 25.14 ardab.