Using photoperiod pathway controlling techniques induced S.officinarum Ludashi to bloom, and distant crossing with Erianthus rockii Yunnan 95-19. 62 seedlings have been transplanted and survived in the field. The survival rate was 81.6%. 4 pairs of SSR primers were chosen to use for authenticity identification of progenies. The results showed that all of the 62 progenies were genuine hybrids, and these SSR primers are quite efficient for identification of Erianthus rockii progenies. The genuine hybrids rate of this cross was 100%, and the F1 population of Erianthus rockii progenies was the biggest one at present.