Abstract: Taipei Water Source Domain is the first specific district of water quality and quantity protection area designated by urban planning, which is the main water source of Taipei . To Prevent water quality and quantity from being polluted, the land resource management are very important. Using of SPOT5 satellite images and Aerial images, we have analyzed the land use changing and environment changing of the source domain by Gaussian Maximum Likelihood Classifier and category changing detection, and accomplished the data of Vegetation, terrain, topography, land use and environment changing in the source domain successfully. The project result shows that the overall classification accuracy is up to 95.60 percentage and the change detection result indicates the two regions which have gone through the largest change.