AbstractThis work investigated the chemical constituents of the essential oil (EO) extracted from different organs (whole plants, flower and fruits, leave and branches) of Caryopteris mongholica. At the same time, the fumigant, contact and repellent effect of the EO from C. mongholicaagainst Lasioderma serricorneand Tribolium castaneumwere evaluated. The main chemical components were identified from the EO included β-pinene (24.77 %), 4-terpineol (15.80 %), β-cis-ocimene (9.31 %), α-pinene (8.20 %), 2-isopropyltoluene (7.37 %). The results of bioassays indicated that EO was toxicity to T. castaneumthan L. serricorne. The results also showed that possessed stronger repellent activity against T. castaneumthan L. serricorne. The results provided a basis for the development and utilization in the future for the control of insects.