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To further improve the registration precision of color remote sensing image, an improved SURF registration algorithm is put forward aiming at solving the problem of low utilization rate of color information and high share of wrong matching pairs. Firstly, a modified descriptor is constructed adding in color information to increase the descriptor's distinctiveness and robustness. Secondly, combined with the ratio of one-way matching and two-way matching, an optimal threshold method is put forward to increase the accuracy. If the Euclidean distance ratio is less than the optimal threshold, the correct matching points could be acquired. And the registered image was obtained based on transformation matrix. Experimental results show, compared with the original SURF algorithm, that the improved algorithm has certain improvement in terms of accuracy and stability while guaranteeing the real time. It has certain values in both theory and practice.