A　new　method　for　automatic　image　registration　was　proposed,　which　included　the　scale　space　projection　and　feature　matching.　Based　on　scale-invariance　of　Harris-Laplace　the　scale　space　projection　applied　Harris-Laplace　detector　to　extract　image　feature,　then,　a　feature　space　on　the　projection　information　in　the　direction　of　feature　main　orientation　was　constructed,　making　feature　space　rotation-invariant　and　resolution-invariant.　The　feature　matching　adopted　feature　space　k-d　tree　distance　matching　to　combine　with　RANSAC,　which　implemented　feature　matching　effectively　and　satisfactorily.　The　experiments　and　comparison　analyses　showed　that　this　method　can　perform　automatic　image　registration　accurately　in　the　different　resolutions　and　rotations.