Considering that the Wald Sequential Probability Ratio Test (SPRT) has poor real-time performance for detecting the soft failure of the airborne GPS receiver, we proposed a revised sequential Bayesian detection method.The method can modify the test statistics continually during the detection, thus can not only reduce greatly the testing time delay of the airborne GPS receiver soft failure, but also has minimum risks for decision-making of test.The simulation results show that:compared with the Wald SPRT method, the improved sequential Bayesian method can detect the soft failure of the airborne GPS receiver more quickly, which indicates that the method possesses a fine real-time performance.Furthermore, the method can decrease the probability of false alarm, so the airborne GPS receiver will have high reliability and stability.