Abstract: Aims at the defects of traditional agriculture information system in solving complex decision-making problems under the distribution network environment, Uses the intelligence, the interaction, the cooperation merit of the multi-agent technology, applies agent-oriented system analysis method based on UML, a kind of agent-based design thought and the realization method be proposed for corn production management co-decision support system. It’s used in to realize crops information sharing, software sharing, the joint operation and the group decision-making support under distributed environment; it can hang together the growth model and knowledge model of corn, realize organic coupling and integration between the function of forecast and decision-making. Through the development, practice and analysis, it’s proved that the multi-agent crop co-decision making model and the system has provided a new technical means and method for the solution of complex decision-making questions in agricultural system, moreover enhanced the accuracy of crops growth forecast and cultivate policy-making.