Ethiopia is one a/the cOllntries with the highest number a/malnourished population in the world Thisrnemanates Fom lack 0/ adequate and balanced diet, prevalence 0/ infectious diseases, socio-economicrndrawbacks and sanitmylhygienic problems. Children and women are most affected by the problem. 77,ernpaper tried to measure the level 0/ child malnutrition in Nonno Reselliement Site and identifY therndemographic, socio-economic, health and environmental de terminant factors associated with thernphenomenon among children aged 6-59 months as measured by stunting, wasting and underweight.rn7his research used a cross-sectional study design and was conductedji'om December 2011- Februmyrn2012 in Nanna reselliement site. 771e reselliement site was organized under three administrativernunitslkebeles! Those all three kebeles were selected purposively/or this study. 77,e required sample sizern(household~) was determined using the /ormula for estimating single population proportion. Therncalculated sample size was allocated proportionally to three kebeles. Simple random samplingrnprocedure was employed to select the required households Fom the three kebeles. LOllelY method wasrnused to select only one child Fom one sample household in case 0/ the availability 0/ more than onernchild/or anthropometric measurements. In the event household that does not have under-five childlrenrnthe next neighboring household was considered Stl'1lctured and pre-tested questionnaire was used torncollect household socia-economic, demographic. health and environmental data. Anthropometricrnmeasurements 0/ the selected under-jive children were also collected using standard weighing scale andrnheight measuring boardrnThe resllits show that the overall prevalence o/malnutrition in the community was high with 46.3% 0/rnthe children stunted, 41.9% underweight, and 11.5% wasted Parental education, wealth status 0/rnhousehold, household size, number 0/ under-five children in the household, age 0/ a child antenatalrncare allendance, source o/water, availability 0/ latrine and sign a/disease in the past two weeks be/orernthe survey were /ound to be the major determinant factors a/malnutrition among under-five children inrnthe study area. Therefore, it requires careji.d attention and systematic actions in the areas 0/ foodrnsecurity, child and maternal healthcare, education and hygienic problems to reduce the existingrnmalnutrition prevalence in the area.