Land surface changes are generally due to natural or human forces. For example, coastal changes, landslide, mudslide, and floods are all triggered by natural forces. While over-developed and illegally waste dumping in slopeland are owing to man-made impacts. Remote sensing as a powerful tool for change detection of wide area land surface can supply fast and accurate processing and analysis. This paper gives an overview about applications of satellite image, including change monitoring of slopeland, landslide analysis, acquiring of surface deformation, and change detection of waterline in west Taiwan. Application of remote science and technology in management and monitoring, including slopeland monitoring and landslide analysis, has been proceeding since 1995 by Water and Soil Conservation Bureau of the Council of Agriculture. These works are all the resources of government’s administration in precaution against natural calamities.