The study was carried out from May 2009 till April 2010 for evaluating the effectiveness of personal protection measures by hammock nets impregnated with Fendona 10SC at dose of 25 mg/m2 applying for mobile popu ations involved in forest work and sleeping in huts in the Ea So N.R., Dak Lak province. In total 17 species of anopheline mosquitoes were recorded from Ea So N.R., including two maj vectors namely An. minimus and An. dirus, and other secondary vectors such as An. aconitus an An. maculatus. While An. minimus was only caught at the community areas, while both last species w re collected at both community areas and in the field huts. The density of the species caught at field huts was 4 times higher in comparison with those collected at the community areas (1.2 mosquitoes/light trap/night and 0.29 mosquitoes/light trap/nigtlt, respectively). In the field huts An. dirus was collected at a ensity of 1.94 mosquitoes/light trap/night and 1.0 mosquitoes/hour/person. The transmission index of n. dirus was H = 0.043. The residual efficacy of Fendona 10SC on mosquito nets could prolong for six months. After five months and 12 months of intervention i.e., using by hammock nets impregnated with Fendona 10SC at dose of 25 mg/m2 applying for mobile populations, the parasite rate was 0.96 percent after five months and 0.49 percent after 12 months of intervention, in comparison of rate of 4.31 percent prior to the intervention.