We made maps of areas prone to erosion in Timor Tengah Selatan regency, province of East Nusa Tenggara using remote sensing and geographic information system. The purpose of this study is to map areas prone to erosion and risks assessment in Timor Tengah Selatan regency East Nusa Tenggara province .The research methods include the use of GIS to make rainfall, land cover map and class slopes map. Based on the results, level of erosion can be divided into three classes. First, areas which are not prone to erosion (127.218,69 Ha), covering districts Noebeba, districts Amanuban South, districts Kualin, most districts Amanuban East and districts Fatukopa. Second, areas prone to erosion (251.082.09 Ha) covering almost all districts Timor Tengah Selatan. Third, areas highly prone to erosion (9.125,1 Ha) covering an area districts Fatumasi, districts Tobu, Mollo Utara, districts, most districts Kot`olin. Keywords: Erosion hazard map, Remote sensing, Geographic information system.