The first and only one recorded collection of Aecidium deutziae in Taiwan was collected by Y. Hashioka on Deutzia pulchra in 1933 without taxonomical description. For characterization of this rust fungus, A. deutziae on D. pulchra again collected near Tataka, Nantou, Taiwan in 2015, was studied. The fungus produced amphigenous spermogonia and cupulate, mainly hypophyllous aecia. The peridial cells have smooth outer wall and verrucose inner walls. Aeciospores are pale orange, globose to broadly ellipsoidal, minutely verrucose with granules. In addition, the DNA sequences covering the LSU, ITS and SSU rDNA regions were obtained.