Abstract: 【Objective】 To elucidate the reason why Potosia brevitarsis Lewis is attracted to sugar-vinegar liquid, and to search for compounds with attractant activity to Potosia brevitarsis Lewis. 【Method】 EAG and “Y”-typed olfactometer were used to tested the EAG and behavioral response of Potosia brevitarsis Lewis. 【Result】 Potosia brevitarsis Lewis contained EAG reaction to 9 volatiles of sugar-vinegar liquid, and the female and male adults had higher EAG reaction values to ethyl valerate, 2, 2, 4, 6, 6-pentamethyl-heptane and furfural, the male adults also had higher EAG reaction values to ethyl lactate and hexanoic acid.The analysis of “Y”-typed olfactometer showed that 2, 2, 4, 6, 6- pentamethyl-heptane and ethyl lactate had good attraction to both male and female adults of the Potosia brevitarsis Lewis.There were gender differences in the selection of furfural and hexanoic acid between female and male adults.Furfural had a good attraction to female adults, but male adults had no obvious tendency to them and hexanoic acid had a good attraction to male adults, while female adults had no obvious tropism to them. 【Conclusion】 2,2,4,6,6-pentamethyl-heptane, ethyl lactate, furfural and hexanoic acid can be used as the components of the attractant formula for the Potosia brevitarsis Lewis.