Studies have been conducted in the form of forest land cover mapping at Mountain Timau, Timor island, East Nusa Tenggara, Indonesia, by comparing changes in land cover classification vegetation for 12 years from 2005 to 2016 (2010 and 2011 data does not exist). Classification method used is Maximum Likelihood Classification / MLC using LANDSAT satellite remote sensing data. From the mapping of forest areas in the Mountain Timau, the amount of forest area showed declining trendline from year to year. These results indicate the occurrence of a negative pattern of vegetation change that is decreasing the density of the forest vegetation and reduction of the total area of forest and pasture area increased over a period of 12 years. As the area is natural, it can be inferred global climate change is one of the causes of this vegetation change, same as some places in the world. Keywords: vegetation index, NDVI, remote sensing, vegetation change, global climate change.