【目的】 核桃举肢蛾Atrijuglans hetaohei Yang是核桃重要的蛀果害虫，通过明确核桃举肢蛾野外田间的羽化节律和交配行为，为核桃举肢蛾的性信息素研究提供基础。【方法】 本研究在田间条件下观察了核桃举肢蛾的羽化节律和交配行为等生殖活动规律。【结果】 核桃举肢蛾需要历时45~60 min完成羽化行为，成虫羽化高峰期集中在5月下旬至6月上旬，具有明显的昼夜节律，上午10:00—13:00为羽化高峰期，高峰期的羽化数占整日羽化量的73.99%。雌雄虫比率接近1∶1，其中羽化前期，雄虫羽化量比雌虫多8.67%，降雨降温天气条件可影响其羽化进程。成虫上午、中午和夜晚静伏不动，下午16:00至傍晚19:30成虫活跃，频繁爬行、飞翔。在此期间，观察到雌虫出现求偶召唤状态及交配行为。雌虫分散产卵，平均产卵量为22.6粒。【结论】 本研究揭示了核桃举肢蛾野外田间的羽化节律和成虫生殖活动行为，雌虫出现求偶、交配行为的时间、状态与环境条件。

[Objectives]  Atrijuglans hetaohei Yang is a major pest of walnuts, seriously affecting both the yield and commercial value of walnut crops. This study aims to provide a reference for further research on the sex pheromones of A. hetaohei by determining adult emergence rhythm and copulation behavior of this species in field. [Methods]  Emergence rhythm, mating behavior and other reproductive activities of A. hetaohei were observed under field conditions. [Results]  Adult A. hetaohei took 45 to 60 minutes to emerge. Yearly emergence peaks of A. hetaohei populations occurred from the last ten days of May to the first ten days of June, and had an obvious diel rhythm; adult emergence peaking between 10:00 and 13:00 with 73.99% of adults emerging during this period. Though the final sex ratio of adults was nearly 1∶1, there were 8.67% more males than females at the beginning of eclosion. The emergence process was influenced by rainfall and low temperature. Generally, adults were relatively sedentary, but crawled and flew more frequently between 16:30 and 19:30. Females were observed engaging in courtship and mating behavior during this period. Female adults laid an average of 22.6 eggs which were dispersed rather than laid in a single location. [Conclusion]  This study provides preliminarily data on the eclosion and reproductive behavior of adult A. hetaohei under field conditions, detailing the time, state and environmental conditions when female adults engage in courtship and mating.