It is important to study the accuracy and stability of satellite clock bias prediction for enhancing the navigation and timing functions of satellite navigation system.Aiming at the defects of GM(1,1) model in the short-term forecast of satellite clock bias, AR model is introduced to modify the forecast result to improve the accuracy and stability of the clock bias forecast results.The experimental results show that the prediction accuracy of the combined model is improved compared to the single GM (1,1) model, of which the accuracy improvement of the error trend of the combined model is similar to that of the GM (1,1) model, but the stability is relatively higher.