For spacecrafts and its propulsion systems, it is very difficult to apply the classical modern control technology to solve the concerned control problems owing to the complexity of systems, the uncertainty and the unknown of the operating circumstances. The implication, function and construction framework of autonomous intelligent control systems are clarified and discussed. The system architecture of remote agent is analyzed. The reconfiguration of propulsion systems for spacecrafts by autonomous control techniques is also discussed. The analyses and discussion can be available for reference in the development of autonomous control systems for our spacecrafts in the future.