Abstract: A new approach for seamless image mosaic based on feature invariant description was proposed. Firstly, the interesting points from two images were extracted by Harris corner detector, and the interesting points were descript by SIFT descriptor. Then the corresponding points were obtained by k-d tree algorithm and RANSAC algorithm. At last, the images were stitched by the corresponding features. The experiments show that this algorithm is invariant to rotation, and it has good robustness to image mosaic.