Faba bean （Vicia faba L.） is an important legume crop in China. Southern China is the autumn planting area of faba bean， where mainly produces large-grained fresh faba bean. The correlation analysis of the seed size-related traits of the faba bean resources from this area was carried out to explore the associated molecular markers applicable for molecular marker-assisted breeding. In this study， phenotype of seed size-related traits in 90 faba bean resources were collected in 2019 and 2020. Sixty-seven pairs of polymorphic SSR markers were used for genotyping， producing a total of 278 alleles with the average alleles of 4.1. The resources were divided into 3 groups by cluster analysis， in which accessions with higher values of seed length， seed width and 100-seed weight are mainly found in the A group. In addition to the population structure analysis， the MLM models （Q+K） of TASSEL software were used to conduct associate studies of seed size-related traits and 67 SSR markers. A total of 50 significantly associated markers （P<0.001） were detected by mixed linear model （MLM） of TASSEL， of which 29 markers had a P-value less than 0.0001. In multiple environments analysis， ICS48 and ICS455 were significantly associated with both grain width and grain weight. According to the association stability and contribution rate， three dominant alleles （ICS48-H1， ICS51-H1 and ICS455-H3） related to seed size were obtained （P<0.0001； r²>18%）. This study will contribute to the molecular marker-assisted selection and molecular design breeding of faba bean in autumn planting areas in China.