Seven acrotrisomics (AT: Acro4S^<4L>, Acro5a, Acro5b, Acro5c, Acro6S^<6L>, Acro7a, Acro11a) and three secondary trisomics (ST: Triplo 4S4S, Triplo 6L6L, Triplo 7S7S) of rice were characterized by morphological and cytological traits. The morphological features of the ATs and the STs were apparently distinguished from both of the disomics and the related primary trisomics (PT) in the self-pollinated progenies. Acro4S^<4L> and Triplo 4S4S exhibit narrow grains, whereas Acro5a, Acro5b and Acro5c show hairy glumes. Culm length, panicle length and grain shape of Acro5a, Acro5b and Acro5c lie in intermediate between disomics and the PT for chromosome 5 Acro6S^<6L> has compact panicles and awned spikelets. Triplo 6L6L has somewhat lax panicle and awned spikelets. These AT and ST are more fertile than the PT for chromosome 6. Acro7a and Triplo 7S7S have round grains, compact panicles and short culms. Acro11a is short in height, with narrow grains and late flowering. The chromosome regions related to the aneuploid syndrome were estimated by the comparison with extra chromosome of the respective AT, ST and PT. Acrocentric chromosomes and isochromosomes were transmitted to the next generation with 30% through the female gametes. The transmission of the extra chromosomes through the male parent was very few except for Acro5a (17%). The frequency of the trivalent formation in the meiosis of the ATs and STs, those extra chromosomes were shorter than their normal homologous chromosomes, were lower than those of the related PTs. These acrotrisomics and secondary trisomics could be useful for cytogenetical studies in rice.