First,the thesis introduced the basic theory of image Matching,the factor of error as the image greyscale distortion and the noise influenced the matching capacity and improved the SSDA algorithm,reduced the quantity of calculation.In order to verify the effective of the algorithem in the thesis,author have done many simulation experiment,the result indicated this algorithm effict was good at matching.It was faster at calculation,the error was smaller at matching and the robustness was better than the tradi...