【目的】 白星花金龟Protaetia brevitarsis是重要农林业害虫，明确其交配节律，可为白星花金龟的监测、预测预报和有效防治提供科学依据。【方法】 本研究在温度（23 ± 1）℃、相对湿度60% ± 5%、光周期14L∶10D的环境条件下，观察不同日龄白星花金龟成虫的交配行为。【结果】 白星花金龟交配行为分求偶、抱对、交尾和交配后保护四个阶段。1-5日龄段白星花金龟成虫没有求偶行为，10日龄以上的成虫有求偶、交尾现象，30-35日龄段为交配高峰。其中10-15日龄段成虫的求偶频率显著低于20-25、30-35和40-45日龄段。10-15日龄段和20-25日龄段成虫的交尾频率显著低于30-35日龄段和40-45日龄段成虫。成虫交配时间主要在11:00-14:00，夜间无交配行为。交配持续1-12 min，平均7.47 min，53.85%的成虫交配持续6-9 min。【结论】 白星花金龟成虫交配行为有明显的昼夜节律性，补充营养对交配行为没有明显影响。

[Objectives]  To investigate the mating rhythm of Protaetia brevitarsis, an important agricultural and forestry pest, in order to improve the monitoring, prediction and control of this species. [Methods]  Mating behaviors of P. brevitarsis adults of different ages were observed at (23 ± 1) ℃, 60% ± 5% relative humidity, under a 14L : 10D photoperiod. [Results]  The mating behavior of P. brevitarsis can be divided into four stages; courtship, mounting, copulation and post-copulatory guarding. No courtship behavior was observed in 1-5 day-old adults. Courtship and copulation occurred in adults over 10 days of age, and peaked in those 30-35 days of age. Significantly fewer 10-15-day-old adults engaged in courtship than those aged 20-25, 30-35, or 40-45 day-old. The mating rate of 30-35 and 40-45 day-old adults was significantly higher than that of those 10-15 and 20-25 days old. Moreover, mating mostly occurred from 11:00-14:00; no mating behavior was observed at night. The duration of copulation ranged from 1 to 12 min, with an average of 7.47 min. 53.85% of observed copulation lasted for 6-9 min. [Conclusion]  The results indicate that the mating behavior of P. brevitarsis adults has an obvious circadian rhythm, and that supplemental feeding has no significant effect on mating success.