Taking 98 accessions of welsh onion as test material，this paper analyzed their diversities
in 16 phenotypic traits．The results indicated that the genetic diversity of welsh onion germplasm resources
were rich．The quantity traits and quality traits of those with the highest diversity index were the tightness
between plant height and leaf node，respectively．Those with the biggest variable coefficient were single plant
weight．The paper also conducted clustering analysis on welsh onion germplasm and divided them into 4
groups．The germplasm of group I were mostly‘drawf and thin’straight type onion．The germplasm of
groupⅡwere chicken leg type with short cauloid．The germplasm of group Ⅲ were mainly of‘tall and
thin’straight type onion with loosen and bigger space between leaf holes．The germplasm of group Ⅳ were
mainly of‘tall and thick’straight type with many wax powder and leaves．