In this paper，the trends of solid rocket propu1sion techno1ogy are discussed. It is necessary that the intercontinenta1 missiles be made small sca1e and are 1aunched on an automobile，a train or a p1ane. So the main trend of SRM for intercontinental missi1e is to improve performance of SRM. In order to make anti-aircraft missiles tack1e the high-speed，high-maneuverab1e target，and to hide the missile site and missile itself，the main trend of SRM for anti-aircraft missiles is to develop the techno1ogy of controlled thrust and smoke1ess propellants. The main trends of boosters for 1aunch vehicles and SRM for small 1aunch vehicles are lower cost and higher re1iability. In addition，it is a1so an important tendency that the techno1ogy of SRM is app1ied to economica1 construction.