Abstract: Change detection is an essential step in spatial data updating. By analyzing existing matching methods, this paper proposes a method for single-and dual-carriageway roads matching considering dual-carriageway road characteristics to adapt the incremental updating of dual-carriageway roads, it is able to extract change information utilizing this method. For the completeness of dual-carriageway roads, the method selects polygons composed of dual-carriageway roads as matching objects, and designs a calculation model about overall single-and dual-carriageway roads matching indicator based on analyzing orientation, length and location relation of old single-carriageway road and polygon. Finally, change information is extracted with the matching relation confirmed by overall matching indicator. Through comparative experiments and analysis, it is proved that this the method can realize changing information extraction in incremental updating of urban dual-carriageway roads, and is really of practical significance.