Ten acrotrisomics for chromosomes 4, 5, 6, 7 and 11 and three secondary trisomics for chromosomes 4S, 6L and 7S were identified by somatic chromosome analysis, pachytene analysis and RFLP gene dosage analysis. Ten kinds of acrotrisomics were designated as Acro4S^<4L>, Acro5a, Acro5b, Acro5c, Acro6S^<6L>, Acro7a, Acro11a, Acro11b, Acro11c and Acro11d, and three secondary trisomics were designated as Triplo 4S4S, Triplo 6L6L and Triplo 7S7S. The respective extra chromosomes of ten acrotrisomics and three secondary trisomics, were as follows: Acro4S4L has an acrocentric chromosome which deleted light stained region of the long arm of chromosome 4; Acro5a, Acro5b, Acro5c contain an acrocentric chromosome with deleted segment or entire long arm of chromosome 5; Acro6S^<6L> possesses an acrocentric chromosome with deleted segment of the long arm of chromosome 6; Acro7a keeps acrocentric chromosome with deleted segment or entire long arm of chromosome 7; Acro11a holds an fragment involving short arm of chromosome 11; Acro11b,Acro11c and Acro11d contain an fragment of chromosome 11; Triplo 4S4S possesses an isochromosome for short arm of chromosome 4; Triplo 6L6L has an isochromosome for long arm of chromosome 6; and Triplo 7S7S contains an isochromosome for short arm of chromosome 7. These acrotrisomics and secondary trisomics can be useful for cytogenetical studies in rice.