【Purpose】To enable conflict avoidance operation planning for support vehicles in complex environments, a dynamic priority classification method is proposed.【Method】This method prioritizes conflict avoidance based on levels of operation efficiency and risk. Additionally, a conflict avoidance operation planning model were established, along with a two-stage algorithm for global path optimization. A low time complexity conflict detection method was also proposed to ensure accuracy in solving large-scale complex problems quickly. 【Result】Compared to the fixed-priority-based two-stage algorithm, the proposed approach improves conflict point reduction by 7.6% and reduces the vehicle-aircraft conflict ratio by 7.5% .【Conclusion】The proposed method meets the requirements of ensuring differentiated vehicle operation, and realizes the function of conflict avoidance path planning in a mixed operation environment of vehicles and aircraft.