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APETALA2/ethylene-responsive factor (AP2/ERF) is one of the largest transcription factor (TF) families in plants, which play important roles in regulating plant growth, development, and response to environmental stresses. <i>Ammopiptanthus nanus</i>, an unusual evergreen broad-leaved shrub in the arid region in the northern temperate zone, demonstrates a strong tolerance to low temperature and drought stresses, and AP2/ERF transcription factors may contribute to the stress tolerance of <i>A. nanus</i>. In the current study, 174 AP2/ERF family members were identified from the <i>A. nanus</i> genome, and they were divided into five subfamilies, including 92 ERF members, 55 dehydration-responsive element binding (DREB) members, 24 AP2 members, 2 RAV members, and 1 Soloist member. Compared with the other leguminous plants, <i>A. nanus</i> has more members of the DREB subfamily and the B1 group of the ERF subfamily, and gene expansion in the AP2/ERF family is primarily driven by tandem and segmental duplications. Promoter analysis showed that many stress-related <i>cis</i>-acting elements existed in promoter regions of the DREB genes, implying that MYB, ICE1, and WRKY transcription factors regulate the expression of DREB genes in <i>A. nanus</i>. Expression profiling revealed that the majority of DREB members were responsive to osmotic and cold stresses, and several DREB genes such as <i>EVM0023336.1</i> and <i>EVM0013392.1</i> were highly induced by cold stress, which may play important roles in cold response in <i>A. nanus</i>. This study provided important data for understanding the evolution and functions of AP2/ERF and DREB transcription factors in <i>A. nanus</i>.