Abstract: On a computer simulating compensation of the transmission error, the time and precision of the calculating forecast error of the time-invarying parameter model is compared with the those of the time-varying parameter model. It is indicated that the transmission error forecast model must be time-varying parameter model. Some methods are proposed in order to heighten forecast speed of the time-varying parameter model and realize the error compensation and control. The results are significalive of actuality to compensation and control of the transmission error.