Forest cover dynamics is a critical global problem that affects the socio-economic and ecological function of forest landscape in the globe The Earth's forest cover is continuously altered by several climatological and anthropogenic factors. And its change influence world carbon cycle and biodiversity pool at local, regional and global scale. Lume district in Ethiopia is one of potential area that has important socio-economic and ecological function. Currently, despite their contribution to both economic and ecological services forests of Lume district are under serious streak both from anthropogenic and natural calamities. Hence, the fundamental aim of this study is to investigate the magnitude, trend and rate of forest cover change for the last 33 years (1985-2018). Quantitative data was collected using Landsat5 TM and Landsat8 OLI_TIRS satellite image, which used to define the spatial and temporal changes. SCP, QGIS 2.18.2, MOLUSCE and EXCEL were used for processing and analyzing data obtained from satellite image (https://earthexplorer.usgs.gov/). Four period Landsat image data of 1985, 1999, 2013 and 2018 were used to produce land cover map in general and forest cover map in particular. The finding of the study depicted that, during 33 years period agriculture land and urban building increased by 728ha (10.82%), 1547.92ha (21.39%) respectively with equivalent decline of 3887ha (5.37%) forestland and 17502.55ha (24.2%) shrub land. Throughout the study periods, steady net increasing rate of expansions observed for urban buildings and agriculture land by 468.8ha and 237.27ha/annual, whereas, a net decline rate noted for scrublands and forests by 530.38ha and 117.8ha/year. The main findings of this study disclosed that, a resume increase in agriculture land and urban buildings and settlements at the expense of forests and shrub lands throughout investigated periods. Hence, in order to revoke the problem of forest cover change and its impact, proper measures had been forwarded which can be implemented both in the long and short-term commitment of anxious stakeholders in the district and national level.