Abstract: Dynamic detection of land use by using remote sensing technique is to make use of remote sensing data which is multisource and multiphrase, and to combine the grid data and vector data to investigate and monitor the lands . We can know their quantities, qualities and attributes, to find the changes of land use actively. But the question is that when we find the polygons of illegal construction lands whose attributes have already been changing, it is difficult for us to get their accurate space location. The main issue discussed in this paper depict how to use images matching technique to solve the proplem of polygon's space location in dynamic detection of land use. The data source is from SPOT-5 remote sensing data.