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For too many unstable matching errors extracted by the traditional feature extraction algorithm in process of big complex images registration, reduces the mosaic image quality because of ghost, fuzzy problem after fusion image. Improved algorithm based on SIFT is proposed in this paper, after extracting SIFT feature from the target image, using the Minimum Neighbor Feature Matching eliminate false matches based on scale and gradient direction information from SIFT descriptor. Then iterate the accurate mapping matrix by using Random Sample Consensus algorithm (RANSAC) and the local root mean squared error (RMSE). After image geometricScorrection,Sadaptive mix linear blend algorithm is proposed to fuse theSoverlap region ofSimage in HISScolor space.SFinally achieve theSfullScolorSimage smooth and seamlessSpanorama stitching. The results show theSproposed algorithm isSaccuracy andSstability in theScomplex sceneSandSwith little splicingSoverlap regions.