Abstract: To study evolving characteristics of a retrograde geosynchronous orbit influenced by major environmental forces, an orbit dynamics model suitable for numerical simulations is given and solved by the advanced RKDP method. Numerical solutions are periodically summed and averaged to get rid of short-periodic-term effects. By analyzing polished data, its orbit characteristics are revealed to us.

Key words: retrograde geosynchronous orbit, orbital dynamics, RKDP method, orbit characteristics