Using F₂ generation of eleven sorghum (Sorghum vulgare) crosses, the broad sense heritabilities and relative genetic advance-merits of nine main traits were studied. The results indicated that the heritabilities of different traits were different and that of the same trait were also different in different crosses. In the crosses having a same female parent but different male parents or having a same male parent but different feamle parents, the affection of different male parents or female parents on the phenotypes of one of the traits in their progenies were different, when a parent was crossed with others, the affection of it on the phenotypes of various traits in its progenies were differnt in different crosses, two. The relative genetic advancements of different traits were different and that of the same trait were also different in different crosses. It is better to use the rdative genetic advancements as a selection index on the hybrid progenies than use the heritabilities only, becaue in this way not only the difference of the heritabilities among the traits is involveed, but also the quantity of the segregative types of the traits.