GEO (Geostationary Earth Orbit) communication satellites are important guarantee for the war. The authors should research the sorting for attack if they want to win the war. Performance parameters of GEO communication satellites are analyzed, and definitions of threat index are established. Subsequently, objective sorting algorithm of GEO communication satellites based on fuzzy theory is proposed, and a mathematical model is established. Processing factors by the fuzzy theory, determining the weight of each threat index, obtaining integrated values of the satellite threat, and the satellites sorting are also included in this algorithm. The simulations in weights completely unknown and partly unknown are shown that the proposed algorithm has high intelligence and provides referenced value for anti-satellite campaign in space.