Abstract: Multiobjective group decision-making theory is effective for solving problems in cooperative management of plant protection system.Taking fungicide and pesticide as protection measures, foreign trade department and farm as decision-makers,yield and quality of orange as objectives, and using multiobjective group decision-making algorithm, the dosage and frequency of applying fungicide and pesticide are determined coordinating with different needs. Main subprograms for multiobjective group decision-making algorithm are given in this paper.

Key words: anammox, denitrification, wastewater treatment, organic carbon source