Abstract: The morphological and karyotipical variations of 8 local populations of Allium mairei Lévl.in Kunming area had been studied in this paper.The results showed that morphological characters of Amairei have abundant polymorphism in populations and obvious polytypism among populations，and the karyotype of Amairei is rather symmetry in SectRhiziridium.Diploid and Tetraploid populations were found in Amairei.The karyotypical formulae of diploid is 2n=2x=14m+2sm,and that of tetraploid is 2n=4x=28m+4sm.There is karyotypical polymorphism in Amairei because of the variations of polyploids，Bchromosomes and satellite chromosomes.

Key words: Allium mairei；Karyotype；Polymorphism；Diploid；Tetraploid；Bchromosome