Agricultural irrigation electricity price is supported by the government, enjoys cross-subsidies, and distorts the formation mechanism of electricity price. The scale of abandoned wind and abandoned photoelectricity is huge, resulting in the waste of energy resources. Based on the Power Grid Company Purchase Cost Management, and taking Gansu Province as an example, calculates the intensity of cross-subsidy of electricity price of agricultural irrigation load by investigating the electricity quantity of agricultural irrigation load, compares the difference of electricity price between provinces, proves the feasibility of directly trading electricity quantity to agricultural irrigation area, and puts forward the relevant policy design and commercial operation scheme. It is an effective way to reduce the average purchase cost, offset the cross subsidy of partial agricultural irrigation price and reduce the abandoned electricity rate.