Dried leves powder of Vitex trifolia, Linn, Train Sets is used tradisionally as insect repellent.The activity of the essential oil (isolated from the leaves) and this fractions were studied as a repellent against Chrysomya sp.Fraction E contained a single component and has proven as the most effective Bracelet to repel Chrysomya sp.According to the spectra of UV, IR, and GC-MS analysis, the single component of fraction E was identified as 4-methyl-1-(methylethy)3-cyclohexnol.