Abstract: Adaptive planning method of canal system in the Daqiao Reservoir irrigation area based on improved multi-objective decision-making model was proposed to reasonably plan water distribution of canal system in the Daqiao Reservoir irrigation area, improve utilization rate of water resources, and reduce ineffective waste water and impact on ecological environment．Multi-objective decision-making function for canal system planning of Daqiao Reservoir irrigation area was to minimize water shortage of each canal system in irrigation area after completion of water distribution, loss of water conveyance through canal and grey water footprint brought by crop production．The multi-objective decision-making model for canal system planning of Daqiao Reservoir irrigation area was constructed with water conveyance capacity, water volume and time of canal as constraints．Grid method was used to build operating environment of path planning, and ant colony algorithm was improved through optimization of moving probability and self-adaptive adjustment of pheromone volatilization coefficient．Through improved ant colony algorithm, planning results of reservoir irrigation area with minimum water shortage, water transmission loss and grey water footprint were obtained．Experiment proved that this method could effectively plan water resources of canal system in irrigation area of Daqiao Reservoir, and planned canal system in irrigation area had a good performance in water shortage, water transmission loss and grey water footprint, with high efficiency and strong applicability．