The method for designing a key SMS monitoring platform of Fengyun3 meteorological satellite data processing system is proposed. The selection of key monitoring positions, the intelligent identification of orbits, the processing of alarming messages, and the way to guarantee high realtime performance are discussed. Based on the detailed analysis of orbit characters, two orbitsidentification algorithms are proposed and discussed. Besides, a SMS filter logic and high efficiency software architecture is adopted to guarantee realtime performance. The operation statistic results are given.