【目的】 明确红脂大小蠹Dendroctonus valens羽化出孔位置及受吸引时的降落位置，为监测和诱捕等防治技术提供理论依据。【方法】 在内蒙古自治区黑里河国家级自然保护区，通过对受害油松的干基部及周边地面进行分区采集，统计红脂大小蠹的出孔位置；统计扬飞期受引诱剂吸引的红脂大小蠹的降落位置。【结果】 红脂大小蠹多在寄主树木根部越冬，成虫出蛰伏后咬破根皮向上挖穿土层到达地表；受害树干基及周围地表不同区域出孔的红脂大小蠹比例存在极显著差异（P<0.001）。在距受害树干基0-50 cm的地表区域内捕获的红脂大小蠹最多，占79.90%±16.99%，其次为距受害树干基50-100 cm的区域，捕获比例为17.77%±14.12%，在树干上捕获的红脂大小蠹的比例较低。明确了红脂大小蠹寻找寄主时的降落位置，在不同区域的降落比例具有极显著差异（P<0.001）。在树干距地表0-50 cm高处降落的红脂大小蠹最多，占比为41.09%±4.25%，其次是树干50-100 cm的区域，占27.47%±4.31%，此外树干100-150 cm的区域、地面距干基0-150 cm范围内也均有红脂大小蠹降落。【结论】 在黑里河地区，红脂大小蠹多在根部越冬，翌年多在距干基0-50 cm的地表区域内出孔并扩散。在使用熏蒸法防治时，建议以受害树为中心覆盖50 cm的地面，如有条件可覆盖到距干基100 cm；红脂大小蠹在寻找寄主时，多降落在树干距地面0-50 cm的高度，建议在较低的高度悬挂诱捕器。

[Objectives]  To improve the prevention and control of Dendroctonus valens by determining the emergence and landing positions this pest. [Methods]  In Heilihe National Natural Reserve, Inner Mongolia Autonomous Region, China, a ground and stem eclector trap was used to count the emergence positions of D. valens. The landing position of attracted insects was also counted during the emergence period. [Results]  Most D. valens overwinter at the root level where adults bite the root bark and burrow upward through the soil to ground level after overwintering. There were very significant differences in the proportion of D. valens that emerged at different distances from infested pines (P<0.001). Most, 79.90%±16.99%, emerged from an area within a 0-50 cm radius of infested pines with the remainder 17.77%±14.12% emerging within a 50-100 cm radius. Few adults emerged from the trunk. The proportion that landed at different heights on the trunk was also significantly different (P<0.001). Most 41.09%±4.25%landed at a height of 0-50 cm from the ground, with a smaller proportion 27.47%±4.31% landing at a height of 50-100 cm. Relatively few landed at heights of 100-150 cm within a radius of 0-150 cm of a pine tree. [Conclusion]  In Heilihe National Natural Reserve, D. valens mostly damages pine roots, and usually emerges within a 0-50 cm radius of pine trees. Therefore, covering the ground within 0-50 cm of pine trees with plastic sheeting should improve the control of this pest with fumigation. If possible, the ground should be covered to a distance of 100 cm from each trunk. D. valens generally lands on pine trunks at a height of 0-50 cm from the ground, so traps should be hung as low as possible.