In the paper a fast terrain correlation algorithm to be called the generlized ordering aequisition of statistics (GOAS) is proposed by means of continuity of the aircratt track，which is better adaptable when the course of aircraft drifts off the axis of reference image. The algorithm can not only serially process the data of real-time image but also continually gives rough match information. Monte-Carlo simulations have shown that its performance was better for the drift angle θ＜5°and its CEP was less than 50m for SNR=3.