Studies on Giant Mole Rats as ecosystem engineers were carried out on Sanettirnplateau, Bale Mountains National Park from July 2008 to March 2009 covering both wet and dryrnseasons. Fifteen 50x50 m2 plots of which five with high giant mole rat density and five with lowrngiant mole rat and five with none-giant mole density were selected for the study on factors thatrninfluence density and distributions on of giant mole rat and the impact on the environment. Inrnaddition to this, ten 50x50 m2 plots of which five with high density giant mole at and five withrnlow density giant mole rat were selected for population and co-existence studies. An estimate ofrn48 maximum and 20 minimum individual giant mole rats were found per-hectare in the presentrnstudy. A total of 75 kg soil samples were taken from studied plots for soil carbon, nitrogen,rnphosphorous and particle density study and 225 bags samples were taken for soil bulk densityrntest. The soil samples were tested for required parameters in Addis Ababa National Soil Test.rnSoil properties, vegetation cover, livestock, grazing season, and slope were factors affect therndensity and distribution of giant mole rats. The soil factors determine the number of mimarnmound formation and number of fresh open and closed holes. The mean fresh open and closedrnholes during dry and wet season were significantly different (t = -2.743, df = 9; P = 0.013 0.005), respectively. Giant mole rat had mutualrnway of living with the alpine chat and commensalisms with murid rodents The maximumrnnumber of giant mole rat observed is statistically positively correlated with number of alpinernchat( = 0.05 ; r = 0.287) and total number of giant mole rats observed positively correlatedrnwith total raptors( = 0.05; r = 0.303) in the studied plots. Combined effect of giant mole rat andrnlivestock would have caused great impact on the ecosystem. Conservation measure aimed at afrornxirnalpine ecosystem of Bale Mountains would take accounts the role of the giant mole rat asrnecosystem engineers.rnKey words: Bale Mountains National Park, ecosystem engineer, giant mole rat, mima mound,rnsoil Carbon, soil bulk density.