Optimizing irrigation profit is essential for enhancing agricultural productivity and ensuring sustainable water resource management, especially under the uncertainties caused by climate variability. It signifies that maximizing irrigation profits has become the primary consideration of current agricultural irrigation systems. By discussing the change in irrigation profits with irrigation fraction f , which represents the proportion of irrigated farmland per unit area of cultivated land, a new method of qualitative diagnosis of irrigation supply and demand balance was proposed by means of the optimal irrigation fraction f₀ corresponding to the objective function y(f) and the correlation coefficient ρ between irrigation water demand anomalies Dˆ and irrigation water withdrawal anomalies ˆI (ρ(Dˆ , ˆI) = 0) (Formula presented.). It will serve as a new attempt to optimize irrigation profits. We argue that the optimal objective function y(f₀) represents the state of equilibrium of irrigation supply and demand. This study proposes a reverse optimization idea, which includes two comparison methods, to estimate the comprehensively optimal irrigation fraction f₀ that maximizes irrigation profits and irrigation profit per unit area while minimizing risks associated with climatic anomalies. By demonstrating that f₀ performs exceptionally well in meeting the objectives of maximizing irrigation profits and minimizing risks across various climatic scenarios, we suggest a robust method for optimizing irrigation profits, which simply calculates ρ(Dˆ , ˆI)(f) = 0 (Formula presented.) because ρ(Dˆ , ˆI) (Formula presented.) is the function of f . Since f₀ could capture the optimal solution to the greatest extent. It can serve as a simple and effective solution to determine the optimal objective function y(f₀) and diagnose the state of balance between irrigation water demand and supply. This method offers practical implications for water resource management and agricultural planning in the face of climate change.