The impressed current linear anode cathodic protection was applied to the aviation oil pipeline in the flight area of a large airport. After the system was put into operation, the effectiveness of cathodic protection and the operation parameters of the equipment were tested. It was found that the off-potentials of buried pipeline in large area didn’t meet CP criteria and the output current of the power supply was much higher than the designed value. Through information investigation, field feeding tests, electrical connectivity tests and numerical simulation calculation, it is clear that the main cause for unsatisfactory potential distribution and excessive current requirement is the electrical connection between buried aviation oil pipeline and grounding of some equipment or structures. The distribution rule and protection distance of pipe to soil potential under linear anode protection was studied by numerical simulation, and the design principle of linear anode cathodic protection for aviation oil pipeline in flight area is proposed.