Thirty-eight compounds, including furfural, coumarin and succinic acid, bis (2-methylpropyl)ester, were found in the volatiles extracted from Cyclosorus parasiticus, by using facility GC/MS. The bioassay showed that the volatiles in different concentration had the oviposition deterrent effect and antifeeding effect against adults of Liriomyza sativae in 24 h after treatment. Furthermore, the effect enhanced with the concentrations improving and weakened with time spending after treatment. The results of the four-armed olfactomater test showed that the volatiles from C. parasiticus influenced the beheivor of L. sativae strongly.