The large-scale ring-column antenna satellite, with the diameter reaching 100 meters, serves as a critical infrastructure in geostationary orbit, primarily provide high-speed data transmission and stable communication services, which requires highly precise and stable orbit maintenance. Given the satellite"s substantial mass and specialized structural design, resulting in significant scale effects, orbit keeping strategies for such satellites become more complex. This paper proposes an optimized layout for distributed thrusters based on the gradient descent algorithm. On the basis of optimized thruster layout, considering the complex effects of long-term space environmental factors, the paper establishes an autonomous electric propulsion orbit-keeping strategy that combines the high-precision orbit prediction algorithm. Numerical results show that the chemical propulsion system consumes approximately 3.5 tons of fuel over 15 years, significantly more than the electric propulsion system. Considering the engine