The rapid development of agricultural economy and power distribution network automation technology provides possiblility for fine management of electric irrigation load and participation in grid regulation. Firstly, the electricity characteristics of electric irrigation load are analyzed. Then the optimum operation strategy of electric irrigation load under the influence of timeshared electricity price is calculated with LINGO model. On this basis, the particle swarm optimization algorithm is used to calculate the optimal operation strategy of distribution network, which takes into account the influence of electric irrigation load. The example based on the IEEE33 is analyzed, which verifies the effectiveness of the operation optimization strategy proposed.