Fruit characteristics of 15-year-old Atemoya (Annona squamosa × A. cherimola or A. cherimola × A. squamosa hybrids) during growth and maturation under natural conditions of Taitung, Taiwan were studied. The growth curve of atemoya fruit was double sigmoid. The fruit had a slow growth period (from 9 to 16 weeks after pollination) between two rapid growth periods, i.e. 1 to 8 weeks and 16 to 24 weeks after pollination. The fruit mature at 24 weeks after pollination had an average weight of 941.4 grams, seed number of 47.5, flesh ratio of 76.0%, and total soluble solids content of 24.0 °Brix.