Abstract: Using F1 population of Lagerstroemia speciosa × L. indica‘Sacramento’，the genetic variation of fourteen main ornamental traits were analyzed，diversity of F1 population was assessed，and 19 SSR markers were employed to perform the linkage analysis between the main ornamental traits and SSR markers. The results showed that the variation coefficients of all nine main ornamental characteristics were more than 10% and ranged from 14.58%–48.33%. The growth habits of F1 seedlings were mostly semi-erect and explanate. The phenotype of flower bud and flower color had no obvious separation. There were correlations between traits. The value of polymorphism information content（PIC）ranged from 0.20–0.59 with a mean of 0.43. Shannon information index ranged from 0.38–1.13，and the average value was 0.82. The average expected heterozygosity was 0.52 and the observed heterozygosity was 0.53，indicating a medium value of genetic diversity in the F1 population. Eight SSR markers were detected，which have significant correlation with eight main ornamental traits，and the interpretation ratio ranged from 3.46%–16.02%.

Key words: Lagerstroemia, SSR, ornamental traits, linkage analysis