Abstract: Primary trisomics are important materials for gene assignment. Chinese kale（Brassica alboglabra L. H. Bailey）inbred line‘9501’was used as material，by root tip cell chromosome number examination，34 plants with a extra chromosome（2n + 1 = 19）were selected from the progenies of triploid（2n = 3x = 27）back-crossing with diploid parent（2n = 2x = 18）；via propagation in vitro and karyotype analysis，four primary trisomics（Tri-1，Tri-6，Tri-8 and Tri-SAT）were obtained from the 2n + 1 plants. Each trisomic showed some special characters in morphological traits，and mainly formed 8 bivalents and 1 trivalent（8Ⅱ+ 1Ⅲ）at meiotic diakinesis，and most cells got 9 chromosomes in a pole and 10 chromosomes in another pole（9/10）at meiotic anaphaseⅠ. The extra chromosomes of the four trisomics can transmit through female and male gametes，and the transmission rates ranged from 10.15% to 27.63% for female and 4.91% to 11.86% for male.

Key words: Chinese kale, Brassica alboglabra L. H. Bailey, trisomics, karyotype analysis