[Aim] The study aimed to understand the effects of oviposition and hatchability of Ophraella communa females.[Method] Under laboratory conditions, three days old (post-eclosion) males and females were randomly selected for the mating experiments. In a mating cage, a virgin male and a virgin female were allowed to mate. The copulation was artificially ended and male was then removed after 1, 5, 15, 30 and 60 min of mating treatments. The females that they completed a naturally copulation were set as the control. Each treatment and control had 23 females, which were allowed to lay eggs on 15~30 cm height twigs of common ragweed. These twigs were inserted into plastic bottles filled with water and changed every day. The number of eggs laid were recorded for each twig removed from the rearing cage. The twigs carrying eggs were placed in a rearing cage and the number of eggs that hatched within 5~7 d was recorded.[Result] The fecundity in the control was significantly higher than in the any other treatments, with 889 eggs per female. Mating success was significantly higher for couple mating for 30 min and more. The eggs from females that mated for less than 5 min could not hatch. Females that mated for more than 30 min had significantly higher hatching rate than any other treatment groups.[Conclusion] The results suggest that 30 min may be the minimum time needed to transfer sufficient sperms during mating. O. communa have prolonged mating behaviours.