采用透射电子显微术，研究了ＧＨ１６９高温合金孔挤压强化层的微观结构。实验结果表明，强化层内位错呈现平面状滑移和交滑移混合特征。随距孔边距离的增加，滑移带变得不甚明显，位错胞的直径略有增加。强化层内的孪晶数量很少，孪生不是ＧＨ１６９合金的主要变形方式。在合金中的γ′、γ”及δ相周围，存在着高密度的位错缠结结构；ＧＨ１６９合金具有较大范围的孔挤压强化层，约为３ｍｍ的深度 Transmission electron microscopy was used to study the microstructure of GH169 superalloys extruded layer. The experimental results show that the dislocations in the strengthening layer exhibit the characteristics of planar slip and cross-slip mixing. With the distance from the edge of the hole increased, the slip band became less obvious, the diameter of dislocation cells increased slightly. The number of twins in the strengthened layer is very small, and the twin is not the main deformation mode of the GH169 alloy. There is a high density of dislocation-entangled structures around the γ ’, γ "and δ phases in the alloy. The GH169 alloy has a large range of hole extrusion strengthening layers, with a depth of about 3 mm