Abstract: Sitophilus zeamais Motschulsky,maize weevil,and Sitophilus oryzae Linnaeus,rice weevil,are two bored pests,whose feeding behavior can not only cause loss of weight and quality of stored grains,but also create favorable conditions for the occurrence of powdery feeding pests such as Tribolium castaneum Herbst.Therefore,the research on mating behavior of Sitophilus zeamais and Sitophilus oryzae is of great importance to reduce its occurrence.In order to understand the mating regularity and mating preference of maize weevil and rice weevil,the mating behavior of maize weevil and rice weevil was observed at different day age under (28 ±5)℃ and (60±5)% RH.The results showed that there was a negative correlation between the mating latency time and the age while mating duration correlated positively with age during 15 days of maize weevil and rice weevil under natural light conditions.The peak mating age of maize weevil and rice weevil were 15 days and 15~20 days after emergence,respectively,during which the maize weevil and rice weevil had the shortest mating latency time,the longest mating duration and the highest mating rate.Compared with the natural light conditions,the mating latency time and mating duration of maize weevil and rice weevil increased significantly in darkness,while the mating rates had no obvious difference.What's more,large body size males of maize weevil and rice weevil got chance to mate easily,accounting for 75.00%±0.58% and 65.00%±1.15%,but the mating latency time and mating duration differed non-significantly.The results revealed that mating duration of maize weevil and rice weevil increased with age,the dark conditions were more conducive to the mating,and maize weevil and rice weevil females preferred to choose heavier males.The research on the mating behavior of maize weevil and rice weevil will provide theoretical support and basic data for controlling them scientifically.