The geology Western Ethiopian Precambrian shield (WES) is known by low-medium gradernmetavolcano-sedimentary rocks, high grade gneiss and migmatites and ophiolite belts. The studyrnarea is a part of high grade metamorphic terrain of Western Ethiopian Precambrian shield thatrnconsists of both high grade Precambrian metamorphic and intrusive rocks. The high gradernmetamorphic rock is represented by orthogneiss, whereas the intrusive rock is represented byrngranite. The integration of field investigation, petrographic and whole rock geochemical analysisrnhas been carried out to understand the petrogenic evolution and tectonic setting of the area. Thernpresence of segregated mafic and felsic rich compositional bands both at the mesoscale and inrnthe thin sections and the abundance of certain minerals such as hornblende and; plagioclase withrnlesser amount of clinopyroxine indicates that the orthogneiss of the study area has been subjectedrnto high grade metamorphism that belong to upper amphibolite facies. Geochemicaly, the studiedrnorthogneiss rock show calk-alkaline magma affinity. Except the granitic gneiss, all the remainingrnsamples have relativelly high concentrations of FeO, MgO and CaO and low concentration ofrnSiO2 content. Their REE abundance pattern shows nearly parallel trend in a negative generalrnslope. The negative slope and calc-alkaline affinity combined with tectonic setting infer that thernoriginal rock of orthogneiss rock is originated from lower enriched mantle reservoir. Therndiscrimination diagram Zr/117-Th-Nb/16 suggests that the original rock of orthogneiss of thernstudy area were developed in the volcanic arc tectonic setting. The overall geochemicalrncharacteristic of granite shows high SiO2 and Al2O3 contents 68.6-77.3 wt % ; 12.04-17.5 wt%rnand lower content of other major oxides. Such as, Fe2O3 1.13-3.59 wt. %, MgO 0.02-0.62 wt %rnand CaO 0.83-1.69 wt.%. It display High K-calk-alkaline and peraluminous magma affinity.rnTheir REE pattern shows only slight variation between the abundances of LREE and HREErnelements which indicates moderate percentage melting. The discrimination diagrams Rb-rn(Y+Nb), Ta-Yb, Rb-(Y+Nb) and Nb-Y, suggested that the granite were developed in volcanicrnarc and syn-COLG environment.