Evaluation on effectiveness of insecticide-treated hammock nets for forest malaria control in Central Highland of Vietnam was conducted from 6/2006-5/2007 in Ea So commune, Ea Kar district, DakLak province. The use of hammock Permanets hed the effectiveness in reducing malaria parasite infections in people sleeping in the forest and forest field: Four months after distribution of hammock Permanets, malaria parasite rate in intervention group was 0.51 percent compared to 4.44 percent before intervention (P 0.01), while in control group was of 1.48 percent compared to 3.11 percent before intervention (P