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<i>AP2</i>/<i>ERF</i> transcription factor family plays an important role in plant development and stress responses. Previous studies have shed light on the evolutionary trajectory of the <i>AP2</i> and <i>DREB</i> subfamilies. However, knowledge about the evolutionary history of the <i>ERF</i> subfamily in angiosperms still remains limited. In this study, we performed a comprehensive analysis of the <i>ERF</i> subfamily from 107 representative angiosperm species by combining phylogenomic and synteny network approaches. We observed that the expansion of the <i>ERF</i> subfamily was driven not only by whole-genome duplication (WGD) but also by tandem duplication (TD) and transposition duplication events. We also found multiple transposition events in Poaceae, Brassicaceae, Poales, Brassicales, and Commelinids. These events may have had notable impacts on copy number variation and subsequent functional divergence of the <i>ERF</i> subfamily. Moreover, we observed a number of ancient tandem duplications occurred in the <i>ERF</i> subfamily across angiosperms, e.g., in Subgroup IX, IXb originated from ancient tandem duplication events within IXa. These findings together provide novel insights into the evolution of this important transcription factor family.