A total of 120 clones with various millable stalks per stool (MSS) at seedling stage and 840 seedlings from 28 families were selected as materials which were respectively planted at two field experiment sties. The broad heritability (h2) and genetic correlations between the number of tillers and MSS were researched based on indices from vegetative propagation of seedlings, including germination rate, the number of millable stalks, MSS and millable stalks per bud (MSB). The results showed that there were very significant differences among germination rate, millable stalks, MSS and MSB whether in genotypes or in levels at seedling stage after vegetative propagation, with an h2 of 0.58, 0.65, 0.84 and 0.84, respectively; The clones with MSS equal or larger than 5 at seedling stage were significantly higher than that of equal or less than 4 in general, and 61.29% of these clones generated MSB equal or larger than 3 at vegetative crop; There were very significant difference in the aspect of genetic correlations among the combinations of the number of tillers and MSS with an h2 of 0.67 and 0.76, respectively; The MSS of seedlings were significantly increased with the level of tillers, and the seedlings with tillers equal or larger than 7 accounted for 30.24%, by contrast, MSS equal or larger than 5 only accounted for 13.81%.