During the real-time control procedure in the satellite operation, it is very important to judge the status of the satellite swiftly and accurately. However, current monitor methods are unsuitable to the complex control procedures, and the professional engineers are responsible for judging the changing states by themselves. To judge the behavior of the commanded satellite automatically, a real-time control concept based on the predicted behavior is presented in this paper, and a real-time monitor system model is designed to cooperate with tele-commands. Moreover, to describe the predicted behavior, we extend the Spacecraft Control Language to Spacecraft Control and Monitor Language. This scheme could describe the goal and the process of a control procedure, and provide a sustaining and accurate judgment in the key operations.R 853 978-1-4244-6044-1/10/$26.00 ©2010 IEEE