Aiming at the orbital maintenance problem of super low altitude satellite for the long duration of the flight, the variation characteristics of the average eccentricity vector were analyzed and an orbital maintenance method was presented. Firstly, the change of average eccentricity vector characteristic of super low altitude satellite under the J₂,J₃ zonal terms and the atmospheric drag was analyzed. Then an orbital maintenance strategy based on energy conservation principle was proposed. Finally, the effectiveness of orbital maintenance strategy was validated by simulation examples. Simulation results show that the changes of average eccentricity is stable under the perturbation of the earth non-spherical gravity, the atmospheric drag and the impulsive maneuver, and the proposed orbital maintenance method can effectively achieve super low altitude maintenance and make the average eccentricity vector converge to equilibrium point. Besides, the fuel consumption for orbital maintenance is reasonable and the long duration flight in super low orbit can be achieved.