Abstract: We explore the method for object-oriented seasonal saltwater lake wetland natural boundary location using multi-source data including high-resolution remote sensing images, DEM(digital elevation model) and so on, taking Yanchi County of Ningxia Province as an example. Taking high-resolution remote sensing images, high spatial resolution DEM generated by LiDAR(light detection and ranging) data, general investigation data on geography and national status and the second national wetland resources investigation data as data sources, we construct the decision rule model with the LBV transform features, NDVI(normalized difference vegetation index), DEM, slope and other features and execute to get the seasonal saltwater lake wetland's natural boundary. Then we analyze the impact of DEM in different spatial resolutions in seasonal saltwater lake wetland boundary extraction. Experimental results show that DEM's participation in appreciate high spatial resolution in seasonal saltwater lake wetland natural boundary extraction can improve the accuracy of boundary location.