Abstract: The heredity of reproductive characters, i.e. inflorescence density, reproductive branch height, inflorescence length, and specule number per spike were analyzed by a mixed model of major genes and polygenes, to reveal the genetic mechanism of these traits. The result showed: 1) The widest variation is found in the inflorescence density that has a coefficient of variance (CV) of 54.10%, followed by the variations of reproductive branch height, specule number per spike and inflorescence length with each CV amounting to 13.17%, 21.89%, 8.92% and 8.42%, respectively. 2) One major gene model with negative dominance (A-4) was the most suitable model for inflorescence density and the heritability of major genes was 60.71%. The reproductive branch height and inflorescence length were all controlled by two addivive-dominance-epistasis major genes model (B-1), and the heritability of major genes were 93.73% and 96.79%, respectively. The most suitable model of specule number per spike was with a no major gene model (A-0). Correlation analysis showed that, leaf length and width had a very significant correlation coefficient of 0.417 8. Leaf length and height of turf also had very significant levels of correlation (0.628 5). The reproductive branch height and inflorescence density, reproductive branch height and inflorescence length, reproductive branch height and height of turf all had significant levels of correlation (coefficients of 0.374 8, 0.356 2 and 0.423 0 respectively).