[Aim] Coconut blackheaded caterpillar, Opisina arenosella Walker, is an important pest of palms that recently invaded China. Studying the local parasitoids of O. arenosella can provide basic information for further utilization of these parasitoids to control O. arenosella.[Method] The parasitoids of O. arenosella in Hainan Island were collected and identified, and then their basic biology, such as development duration, sex ratio and adult longevity were recorded.[Result] The collected parasitoids of O. arenosella are including larval parasitoid Habrobracon hebetor, and pupal parasitoid Brachymeria nosatoi and Chouioia cunea. The developmental durations (from egg to adult) of B. hebetor, Brachymeria nosatoi and Chouioia cunea were 11.8, 19.6 and 20.6 days respectively. The numbers of emerging individuals were 10.1, 1.0 and 81.5 per host. Female adults accounted for 26.6%, 40.6% and 89.8% of the total individuals. For all three species, the females took longer time than the males to grow on O. arenosella under rearing conditions of (26±2)℃ and (75±10)% RH.[Conclusion] Identification of three local parasitoids could be used in the control of O. arenosella.