Abstract: Due to the high order characteristics of the steam temperature for CFBB and the design way of Smith forecast estimate delay system, an adaptive deeoupling control system of the model reference combining the internal model principle is put forward. The control system effectively eliminates the harmful effects caused by the controlled object's high order eharacteristics, and eliminates the coupling relation of the steam temperature changed by the volume of the giving water. The system is simple and practical, and has an engineering value. The system is applied to a worksite and good control result is obtained.