Anti mosquito preparations are household health preparations solution used to prevent mosquito attack. Typically used in outside the human body,Â such asÂ the hands andÂ feet.Â Anti-mosquitoÂ preparations do notÂ have to useÂ the active ingredient made â€‹â€‹from chemicals, butÂ can alsoÂ usesÂ active ingredientsÂ from natural ingredients.Â For example,Â using Legundi oilÂ becauseÂ itsÂ Camphene and pinene compoundÂ which have anÂ characteristic odorÂ that makesÂ the mosquito avoided.Â Thus,Â the studyÂ was done in orderÂ toÂ find out legundiÂ effectiveness ofÂ essential oilsÂ as an anti-mosquito andÂ toÂ make theÂ right formulation of the sprayÂ insect repellentÂ preparations. The research was conducted at the Laboratory of Microbiology,Â Pharmacognocy, and Pharmaceutical Laboratory of Pharmacy Academy Putra Indonesia Malang beganÂ from April to JuneÂ 2011.Â The experiment was conductedÂ in three stages, namely:Â first, the preparation phaseÂ which includes theÂ preparation of determinated Legundi leaf samples andÂ tools andÂ materials preparation which used in the study. Second,Â the implementation phaseÂ which includes the selection ofÂ aÂ green coloredÂ Legundi leaf,Â and then weighed.Â FurtherÂ refinedÂ by usingÂ theÂ leaf steam distillationÂ for 8Â hours.Â Third,Â the final stage is organoleptic, density, refractive index test ofÂ Legundi oil,Â thenÂ the purity tested oil will beÂ used asÂ the activeÂ ingredientÂ inÂ the manufacture ofÂ anti-mosquitoÂ preparations concentration ofÂ 13%,Â 15%,Â and 17%.Â The efficacy of legundi oil preparationÂ can be known by testÂ its effectivenessÂ againstÂ mosquitoes. The results showedÂ thatÂ Legundi oil concentrationÂ 17%Â is effectiveÂ asÂ anti-mosquitoÂ preparations,Â as shown by the preparation sprayedÂ on the clothÂ were seizedÂ fiveÂ mosquitoesÂ in observationÂ for 60 minutes.Â Â Â Â Â Â Based on this research,Â more researchÂ aboutÂ theÂ activityÂ testing of LegundiÂ oilÂ asÂ a naturalÂ mosquito repellentÂ preparations can beÂ suggested by usingÂ a wider room for observation.Â In addition, anotherÂ innovationÂ such as gel or lotion anti-mosquito preparation should be done.